PDF Summary:Eat Your Ice Cream, by Ezekiel J. Emanuel

If you’re tuned in to any wellness content these days, it’s easy to believe that staying healthy requires constant research. Everyone seems to have an opinion about which supplements, fitness protocols, and cutting-edge “biohacks” will miraculously perfect your body and mind. Health policy expert Ezekiel J. Emanuel argues that the healthiest individuals ignore this noise, instead focusing on building simple, foundational wellness habits—and allowing themselves to enjoy occasional treats like ice cream.

In this guide, you’ll gain a comprehensive overview of Emanuel’s approach to wellness and learn how best to care for your body and mind over a lifetime. We’ll also explore Emanuel’s critiques of misguided wellness trends such as expensive sleep trackers and the “miraculous” power of Zone 2 cardio exercise. In addition to Emanuel’s advice, we’ll explore ideas from relevant books on wellness like The Happiness Project and Why We Sleep. We’ll also explain how to best implement Emanuel’s advice with tips from Atomic Habits and Tiny Habits.

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Don’t use junk food as a reward for sticking to your healthy eating habits, though—this undermines the identity of “healthy eater” you're trying to build. Feel free to enjoy these treats occasionally, as Emanuel recommends, but don’t incorporate them as part of your strategy.

Avoid Ultra-Processed Foods

Emanuel writes that the most harmful part of most modern diets is ultra-processed food: industrial products made of dense combinations of sugar, salt, carbs, and fat designed to trigger intense cravings and overeating. Many common products fall into this category, including white bread, potato chips, frozen “instant” entrees, sweetened yogurts, and certain processed meats and cheeses. Soda is particularly important to cut from your diet, as it’s very easy to overconsume and has no nutritional value.

Generally, these ultra-processed foods are twice as caloric as an equal portion of unprocessed food, which can lead to significant weight gain. They’re also very high in salt, which may cause elevated blood pressure and kidney dysfunction. Emanuel recommends that no more than 20% of your daily calories come from ultra-processed foods.

Understanding the Nuances of “Ultra-Processed Food”

The term "ultra-processed food" comes from the Nova food classification system, developed by researchers at the Center for Epidemiological Studies in Health and Nutrition at the University of São Paulo, Brazil.

Ultra-processed food—the industrial products Emanuel describes—comprise “Group 4” in the Nova System. Group 1 includes unprocessed or minimally processed foods, such as fresh fruits and vegetables, eggs, milk, meat, rice, and plain yogurt. Group 2 covers processed culinary ingredients: Group 1 foods that have been pressed, refined, ground, or milled into things like vegetable oils, butter, salt, sugar, honey, and vinegar. Group 3 consists of processed foods, made by adding sugar, oil, or salt to Group 1 foods to extend shelf life or enhance flavor, such as canned vegetables and beans, cheese, salted nuts, cured meats, and freshly made bread.

However, the Nova system isn’t a perfect measure of which foods are healthy. It judges foods solely on how they’re made, not on their nutritional content—meaning a fortified whole-grain cereal and a bag of candy can end up in the same category. Likewise, not all ultra-processed foods are equally unhealthy. For instance, some research finds that some ultra-processed breakfast cereals, whole-grain breads, yogurt, and other dairy-based foods are associated with a lower risk of Type 2 diabetes. Note that these foods are less caloric and sodium-heavy than other ultra-processed foods, so they may minimize the nutritional downsides Emanuel describes.

Furthermore, though Emanuel recommends that no more than 20% of your calories come from ultra-processed foods, a USDA study demonstrated that a diet of more than 80% ultra-processed foods could still score a “healthy eating index” of 86 out of 100 if the foods were chosen carefully. For instance, canned vegetables, canned beans, instant oatmeal, and dried fruit can be categorized as “ultraprocessed” but still have enough nutrients to satisfy recommended daily servings. In short, the label of “ultra-processed food” may oversimplify the connection between how a food is made and its impact on health.

Eat Balanced Meals

So what should you eat? Emanuel advises prioritizing foods that are high in fiber, such as whole grain bread and pastas, bran and oats, nuts and legumes, and fruits and vegetables. Dietary fiber regulates blood sugar, curbs appetite, and supports gut health, yet most people don’t eat enough of it.

(Shortform note: The lack of fiber in ultra-processed foods is likely a major reason why they’re so unhealthy. Ultra-processed foods use refined grains that have had their most fiber-rich components, the bran and germ, removed. Research suggests that ultra-processed foods produce effects that are the opposite of those associated with fiber: They cause spikes in blood sugar, make people hungrier, and prevent beneficial microbes that live in the gut from getting the nutrients they need to survive.)

Protein should be another major part of your diet, and it’s much easier to get enough of it than most people think. Emanuel asserts that people only need 0.75 to 1.00 grams of protein per kilogram of body weight each day. Thus, a few reasonable portions of foods like eggs, yogurt, nuts, beans, and cheese will quickly meet your protein needs. Although meat is a valuable source of protein, it’s best eaten in moderation, as it’s very caloric and can lead to heart disease and other health problems if consumed in high quantities.

(Shortform note: In Outlive, Peter Attia contends that most people should consume twice as much protein as Emanuel recommends—1.6 grams per kilogram of body weight. He recommends even more—2.2 grams—if you’re actively exercising to build muscle. Consuming protein is necessary to maintain muscle mass, which protects against injury and strengthens your metabolism, into old age. In general, Attia is more supportive of eating meat than Emanuel, and he maintains that the health risks of red meat are overblown.)

Finally, although some nutrition experts contend that dairy may increase the risk of some cancers, Emanuel recommends including it in your diet, as it protects against other cancers and is a great source of protein and other nutrients. Mostly unprocessed dairy products like milk, cheese, and yogurt are likely to improve your overall health and longevity, especially if they replace less healthy parts of your diet.

(Shortform note: The differing advice on dairy highlights the fact that it’s a particularly controversial category of food. Debate over the benefits and risks of dairy consumption is perhaps the most intense when it comes to raw, unpasteurized milk. Proponents of raw milk contend that it preserves healthy nutrients, enzymes, and bacteria that would otherwise be removed through pasteurization, while opponents of raw milk fear that neglecting pasteurization could contribute to the spread of pathogenic bacteria like E. coli and outbreaks of diseases like bird flu.)

Foundation #3: Exercise

Wellness Myth: Zone 2 Aerobic Exercise Is the Only Cardio That Matters

Emanuel notes that Zone 2 cardio—a steady, moderately intense form of aerobic exercise—has blown up on social media as the supposedly optimal form of cardiovascular training. Its proponents contend that this exercise strengthens mitochondria (the organelles that produce cellular energy), accelerating weight loss. However, studies show that more intense forms of cardio, specifically sprint interval training and high-intensity interval training, are better at building mitochondria. Emanuel argues that this is an example of an overblown wellness trend that distracts from simpler wellness habits.

The Magic of Mitochondria

Although Emanuel dismisses Zone 2 cardio as an overblown health trend, he validates that the mitochondrial function it supposedly optimizes is an important marker of cellular health. Recent research indicates that mitochondria not only create cellular energy, they also support the immune system and may even ward off chronic diseases associated with old age, such as Alzheimer’s and cancer.

These benefits make mitochondrial health a prominent selling point of unproven health solutions such as longevity supplements. However, the surest way to support your mitochondrial health is to practice daily healthy habits. Exercise is key, but while Emanuel notes that sprint interval training and high-intensity interval training are best at building mitochondria, other experts claim that a combination of endurance and resistance training is ideal.

A balanced diet rich in fiber, healthy fats, B vitamins, and antioxidants also gives your mitochondria the fuel and nutrients they need. Finally, getting sufficient sleep each night allows your cells to clear out mitochondrial damage accumulated during the day, keeping them healthy.

The Simple Truth: Any Movement Is Good for You

Any regular exercise—even if you do it casually or imperfectly—provides serious wellness benefits, writes Emanuel. Exercise reduces risks for almost every major disease: cancer, diabetes, heart disease, stroke, dementia, and more. Even small amounts of exercise have a massive impact on your health: In a study of over 400,000 people, 15 minutes of daily exercise was linked to three additional years of life expectancy, with additional one-year longevity gains for each extra 15 minutes per day. Plus, exercise improves your mental health, reducing symptoms of depression, anxiety, and overall stress.

(Shortform note: The physical health benefits of exercise that Emanuel describes may be caused, at least in part, by exercise’s positive effects on mental health. Happiness functions as a significant predictor of longevity in healthy populations—an effect as significant in magnitude as the difference between smoking and not smoking. Furthermore, when researchers studied the same individuals over time, they found that initial happiness levels predicted their future health much more strongly than initial physical health predicted their future happiness. Thus, happiness is likely to be a significant driver of health and longevity, not just a side effect.)

There are three types of exercise that Emanuel recommends for everyone: aerobic, strength, and balance and flexibility work. Aerobic exercise (sustained movement that increases your heart rate and breathing) strengthens your heart and lungs. Strength training builds muscle and helps you keep it as you age. Balance and flexibility training preserves your range of movement. If you rotate your workouts between all three types, you’ll get well-rounded training, give your muscle groups time to recover, and protect your body from injuries.

(Shortform note: While rotating between aerobic, strength, and balance and flexibility training forms a solid foundation, experts also highlight the importance of a fourth pillar: dedicated core training. The muscles of the abdomen, lower back, and pelvis act as a bridge connecting upper and lower body movements, increasing the efficacy of those muscle groups and protecting your spine. To strengthen your core, do exercises that engage it without external support, such as planks, bridges, and situps.)

Emanuel recommends that you get at least 150 minutes of moderate exercise every week, or 75 minutes of vigorous exercise. He notes that exercising more than this won’t hurt you, but the health benefits aren’t as significant beyond this point. To make the habit easier to adopt, start by exercising just a few minutes per week and work your way up. Also, make sure to warm up before exercising: 10 or 15 minutes of light cardiovascular exertion will protect your heart health, and it’s more likely to help prevent injuries than stationary stretches.

(Shortform note: While 150 minutes of moderate exercise per week is widely recognized as the baseline for health benefits, this number is a general guideline, not a one-size-fits-all prescription. Older adults, for instance, may need more strength training to counteract natural muscle loss, or more balance and flexibility work to maintain mobility. Consider breaking your workouts up into mini-sessions, such as doing three 10-minute sessions throughout your day, to make the habit easier to adopt. You may not need to warm up as much for these gentler mini-sessions, making them even easier to fit into your busy schedule.)

Foundation #4: Sleep

Wellness Myth: Expensive Sleep Trackers Will Help You Rest Better

Emanuel contends that improving your sleep is one of the most important things you can do for your health. Low-quality rest actively shortens your life, more than doubling your risk of serious diseases like heart disease and Type 2 diabetes while significantly raising your odds of developing dementia and cancer.

(Shortform note: Despite the fact that low-quality sleep has catastrophic physical health effects, most people aren’t aware of just how important it is. For this reason, Matthew Walker (Why We Sleep) makes the case that comprehensive sleep education should be a mandatory subject in physical education classes.)

Unfortunately, “smart” sleep trackers are much less effective at improving your sleep than they seem, argues Emanuel. Devices like Oura Rings, Fitbits, and Apple Watches only monitor your sleep indirectly, guessing your most likely stage of sleep based on your motion, heart rate, and other proxies. Thus, they generally overestimate your total sleep time, fail to recognize nighttime awakenings, and misclassify sleep stages.

Emanuel also notes a bigger problem with sleep trackers: Obsessing over sleep data can actively make your sleep worse, since worrying about it makes it more difficult to fall asleep and fully rest.

(Shortform note: Although Emanuel highlights the risk that tracking your sleep will make you more anxious about it, it’s possible to use sleep trackers wisely and improve your sleep. The key is to focus on long-term trends rather than fixating on the exact breakdown of sleep data for a night. For instance, you may notice that you have lower quality sleep when you eat meals late at night, so you adjust your eating schedule. Sleep trackers don’t need to be perfectly accurate in classifying sleep stages or otherwise monitoring sleep for you to use them in this way—the relative changes over time matter more.)

The Simple Truth: To Sleep Well, Listen to Your Body

To get high-quality rest, listen to the signals your body is sending you and build a sleep routine around those signals. Emanuel explains that sleep needs vary widely: Some people function well on six hours or fewer, while others need upward of 10. Your chronotype—your body’s natural daily rhythm of alertness and sleepiness—is also unique to you. Aligning your sleep with your chronotype leads to better sleep and sharper daytime functioning.

To discover your optimal sleep schedule, rest without setting a morning alarm for a week. Go to bed only when you're genuinely sleepy, let yourself wake naturally, and pay attention to the pattern that emerges. Then, try to consistently stick to that schedule.

(Shortform note: In Why We Sleep, Matthew Walker explains that human beings evolved to have varying chronotypes because this helped groups of people to survive. If some members of a tribe were more alert early in the morning and others were more alert late at night, it ensured that the collective was constantly on guard against threats. The fact that your chronotype is genetically determined, a fixed part of your DNA, explains why you’re able to find your optimal schedule by listening to your body. This logic, however, doesn’t explain why individual sleep needs vary—this seemingly can only be attributed to random genetic variance.)

Emanuel also recommends creating the ideal conditions for high-quality sleep: Don’t take naps after 2 p.m., cut off caffeine at least seven hours before bed, and avoid looking at screens for an hour before sleep. Keep your bedroom cool and dark, and don't keep clocks anywhere you can see them at night. Avoid melatonin and other medicinal sleep aids, too—they generally don't deliver quality rest.

(Shortform note: What do you do if you’ve followed all Emanuel’s guidelines for good sleep and still lie awake at night? Experts recommend that after spending 15 or 20 minutes in bed, you should get up and do a gentle, relaxing activity—away from your bed. If you stay in bed while suffering from insomnia, your brain may start to associate being in bed with wakefulness and sleep-related anxiety, making it harder to fall asleep in the future.)

Foundation #5: Cognition

Wellness Myth: Crossword Puzzles Keep Your Mind Sharp

According to Emanuel, many people fear losing their cognitive function as they age more than almost anything else. To counteract cognitive decline, many try to stay mentally “active” with crossword puzzles or similar brain games.

However, these kinds of repetitive mental activities don’t build true cognitive resilience. Emanuel explains that they reinforce the same narrow neural pathways over and over, meaning they only preserve your ability to do those specific activities. The kind of cognitive function that declines with age, and that we want to preserve, is fluid intelligence: the capacity to reason through unfamiliar problems, think critically, and pick up new skills. Any mental activity that doesn’t require this kind of intelligence does little to protect it.

Internet-Induced Cognitive Decline

Just as repetitive activities like crossword puzzles mainly preserve the specific skills they train, frequent internet use may be rewiring our brains for internet use in ways that amount to a form of cognitive decline. In The Shallows, Nicholas Carr argues that the internet trains us to skim through bite-sized content and jump from topic to topic via hyperlinks, making it harder to sustain attention on complex texts that require prolonged concentration. Ultimately, this stunts our capacity for deep thinking.

Carr also believes that internet use has impacted our social cognition, potentially causing us to lose our capacity for empathy and compassion. These aspects of social cognition require sustained, undistracted engagement with another person's point of view—skills that aren’t used on the internet.

Taken together, both effects show that as the brain becomes increasingly adapted to rapid task-switching and surface-level processing, it may lose the ability to maintain the slow, continuous focus required for deep understanding—a core feature of cognitive decline.

The Simple Truth: New, Diverse Challenges Preserve Cognitive Health

To protect your cognitive health as you age, the most important thing you can do is keep learning new things. Emanuel explains that gaining a broad education helps you build cognitive reserve: a network of diverse brain connections that protect against cognitive impairment. The more subjects and cognitive skills you learn early in life, and the more you continue to learn later in life, the longer it takes for mental decline to set in as you age.

(Shortform note: No matter how much you learn, your fluid intelligence—the more adaptable kind—will eventually decline with age. In From Strength to Strength, Arthur C. Brooks contends that growing older requires you to accept this fact and prepare to change the direction of your career in response. Although fluid intelligence decreases with age, your crystallized intelligence—the knowledge and wisdom you’ve accumulated in life—continues to grow. Thus, you can continue doing good work by shifting into a career that allows you to make the most of your crystallized intelligence, such as a coach or advisor.)

Learning the ins and outs of new hobbies throughout your life will also help maintain cognitive function. Emanuel recommends seeking out unfamiliar activities that require you to exert genuine effort, such as learning a new musical instrument. This kind of deliberate engagement becomes especially critical after retirement, when the complex mental demands of work disappear.

(Shortform note: Difficult hobbies aren’t just valuable because of their cognitive benefits—they also add more joy to your life than other leisure activities. In The Happiness Project, Gretchen Rubin argues that difficult hobbies like learning a musical instrument are more rewarding because they give you the sense that you’re growing as a person. Although it’s easier to find the time for these activities after retirement, Rubin recommends practicing difficult hobbies no matter what stage of life you’re in.)

Avoid High-Risk Activities

Protecting your cognitive function also means avoiding activities that involve unnecessary risks of brain damage. Full-contact sports like football and boxing carry a high risk of repeated head impacts that can lead to long-term brain degeneration, and Emanuel recommends avoiding these sports entirely. Although it’s obvious, driving while intoxicated also dramatically raises the risk of serious accidents and head injuries and should be avoided at all costs. Texting while driving is similarly unsafe, making a crash 23 times more likely.

(Shortform note: The risks of contact sports and reckless driving may not be equal for everyone—genetics can significantly influence how vulnerable an individual is to brain damage. According to David Epstein (The Sports Gene), the APOE4 gene marks a heightened risk of complications when recovering from blunt force head trauma, as well as an increased risk of dementia and cognitive impairment in the long term. About 25% of people carry at least one copy of this gene, and 2-3% of people carry two copies, which is associated with an even greater risk of lasting brain damage.)

Furthermore, Emanuel notes that alcohol use, even at low levels, has been associated with increased dementia risk and brain degeneration. This, in addition to its strong link to several major cancers and other chronic health conditions, has led health authorities to state that there’s no truly safe level of alcohol consumption. It’s unlikely to cause serious harm if you have a light drink during occasional social events, but avoiding alcohol altogether is safest.

Chronic cannabis use also appears to have lasting cognitive downsides, with long-term users showing sizable declines in memory, attention, and mental speed. These cognitive declines are not seen in tobacco smokers—although Emanuel strongly cautions against smoking tobacco, too. He sees smoking as perhaps the single most destructive habit people adopt, as it vastly increases your risk of a wide range of life-threatening diseases, including cancer and heart disease. Vaping, though often perceived as a safer substitute, is not risk-free either, with significant research tying it to increased rates of emphysema and cognitive impairment.

How to Help People Who Struggle With Substance Use

Alcohol, cannabis, tobacco, and vapes all contribute to cognitive decline and other serious health conditions, especially when consumed regularly and chronically. However, if you want to help someone who is dependent on these substances, reminding them of these painful physical realities is unlikely to help. People with substance use disorders are not unaware that their habit is harming them. Rather, chronic substance use causes physiological and structural changes to the brain that actively reinforce continued use.

When loved ones ignore this physiological reality, they often view the substance use issue as the substance user’s own moral failing or lack of willpower. However, blaming someone for their substance use disorder only makes them feel more ashamed, which motivates them to seek social isolation and continue using.

Instead, if you want to help, treat people with substance abuse problems with respect. Listen to them and believe what they tell you about their own life. Most importantly, don't pull away. Supportive relationships are essential for people dealing with substance use problems.

Foundation #6: Purpose

Wellness Myth: A Longer Life Is Always a Better Life

Many prominent voices in modern wellness culture frame the optimization of longevity and health as the most important part of life. However, Emanuel’s central message is that the habits that support your health are meant to help you live a good life but are not the purpose of life in themselves. Living for a long time won’t make you happy unless you spend those years doing something meaningful.

(Shortform note: Wellness experts have been proclaiming “longevity is overrated” for thousands of years. In Meditations, which was written in the second century CE, the Roman emperor Marcus Aurelius contends that a longer life is not inherently better than a shorter one. After all, death comes for everyone eventually, whether they live 50 years or 5,000 years. All anyone ever has is the present moment, and a “good” life is one in which you consistently make the most out of “right now.”)

The Simple Truth: Happiness Comes From Serving Others

Emanuel argues that happiness and fulfillment in life are not something you can pursue directly. Pursuing longevity won’t make you happy, nor will pursuing pleasure. Rather, fulfillment is a side effect of dedicating your life to something more important than just yourself.

The most reliable way to find this kind of meaning in life is to build your life around service: Grow as a person and work toward improving the lives of others. Emanuel believes that the foundational habits of wellness we’ve been discussing in this guide only matter because they empower you to pursue this kind of meaningful life.

(Shortform note: Finding a sense of meaning in life may even help you live longer than if you were to pursue longevity directly. In Ikigai, Héctor García and Francesc Miralles argue that the residents of Okinawa Island in Japan have the longest average life expectancy in the world due in large part to their dedication to their life purpose, or ikigai, within their community. Okinawans form tight, lifelong social groups called moai, and they center their daily lives around helping each other thrive. They don’t intentionally strive to extend their own lives, and paradoxically, this helps them live longer.)