Eat Your Ice Cream

Ezekiel J. Emanuel, a physician and health policy expert, argues that Americans are overwhelmed by contradictory and often unproven wellness advice. A long and healthy life, he contends, requires only six straightforward, evidence-based behaviors, and wellness should be part of daily routine rather than an all-consuming obsession.

Emanuel opens with a cocktail party exchange in which guests ask whether a daily glass of wine is healthy. He critiques what he calls the "wellness industrial complex": social media influencers, tech billionaires pursuing extreme longevity regimens, and bestselling books that extrapolate findings from animal studies to humans without evidence. Americans already live long lives, he notes: Average life expectancy is 78.6 years, and the longest-lived 20% average 93. The goal should not be to outlive others but to live a healthy and fulfilling life. He identifies a critical gap in mainstream wellness discourse: Most popular writers emphasize only diet, exercise, and sleep while neglecting risk management, friendship, and mental engagement, which he argues have a measurably greater impact on health.

He lists his six wellness behaviors: avoid self-destructive risks, cultivate social relations, stay mentally sharp, eat healthy food and drink, exercise regularly, and get sufficient rest. Before presenting them, he addresses behavior change, citing research by his Wharton School colleague Katy Milkman showing that willpower is a depletable resource. He advises readers to focus on one change at a time and accept that perfection is unnecessary. He points to Blue Zones, regions with unusually high concentrations of centenarians, such as Okinawa, Sardinia, and Loma Linda, where residents live routinely to 90 or 100 by integrating balanced meals, natural activity, and socialization into daily life.

The first rule, "Don't Be a Schmuck," frames risk avoidance as the most impactful first step. Emanuel illustrates it with a teenage memory of buying a car without checking it could go into reverse, prompting his father to summarize the lesson as "Don't be a schmuck." He identifies smoking as the foremost self-destructive behavior, noting that smokers lose an average of 10 years of life and quitting by age 44 restores about nine. He warns that vaping carries its own risks, with a study of over 250,000 people finding exclusive vaping significantly associated with emphysema. On alcohol, he takes a pragmatic position: Heavy drinking and drinking alone are unequivocally harmful, but social drinking in moderation is acceptable. He warns against texting while driving, which increases crash risk 23-fold, and strongly endorses vaccines and cancer screening. He critiques PSA screening, a blood test measuring prostate-specific antigen levels, arguing it reduces prostate cancer deaths by only one in 1,000 men while carrying significant risks of overdiagnosis and harmful treatment side effects. He also argues that gun ownership, unless for hunting, doubles homicide risk.

The second rule, "Talk to People," argues that cultivating social relationships is the most important wellness behavior. Emanuel introduces this through his parents: his father, Benjamin Emanuel, who died peacefully at 92 after a lifetime of striking up conversations with strangers, and his mother, still socially engaged at 91. He presents the Harvard Study of Adult Development, begun in 1938 and now spanning roughly 85 years, whose central finding, as summarized by current director Robert J. Waldinger, is that good relationships are the single strongest predictor of both happiness and longevity. The 2023 surgeon general's report found that social isolation increases premature death risk by 29%, comparable to smoking 15 cigarettes a day. Emanuel documents declining American social connection: the percentage of adults with five or more close friends dropped from 63% in 1990 to 38% today, and 25% of Americans now eat all meals alone. He blames smartphones and social media, citing studies showing that a phone's mere presence on a desk reduces cognitive capacity. He recommends being an initiator of conversations, creating phone-free zones during meals, and cultivating brief interactions with strangers.

The third rule, "Expand Your Mind," uses Benjamin Franklin as a model of lifelong intellectual vitality, tracing Franklin's productivity after age 70, from securing French support for the American Revolution to writing his final anti-slavery article at 84. Emanuel distinguishes between crystallized intelligence, the accumulated knowledge preserved into old age, and fluid intelligence, the ability to think critically about novel problems, which begins declining around age 45. He explains that cognitive reserve, built through education and enrichment, can delay noticeable impairment from the 60s into the 80s or 90s. He recommends learning a new language, playing an instrument, or trying unfamiliar recipes, while warning against passive activities like excessive television watching. He addresses retirement, arguing it likely accelerates memory decline, and advises retirees to plan intellectually stimulating activities.

The fourth rule, "Eat Your Ice Cream," presents dietary recommendations organized around three things to eliminate and several positive behaviors to adopt. Emanuel identifies soda as the first target, noting that diet sodas are no healthier since artificial sweeteners impair glucose tolerance. He also targets snacks, which contribute roughly 500 calories daily to the average American diet, and ultra-processed foods, linked to heart disease, obesity, diabetes, cancer, and dementia. On the positive side, he recommends fermented foods to diversify the gut microbiome, dairy products (especially unsweetened yogurt), adequate protein with emphasis on leucine (an essential amino acid the body cannot manufacture), fiber-rich foods, healthy unsaturated fats, unprocessed carbohydrates, reduced salt, and moderate alcohol consumed socially. He advocates cooking at home and eating with others. He critiques supplements, noting that multivitamins show no benefit for heart disease, cancer, or dementia.

The fifth rule, "Move It!," argues that regular physical activity is essential but that extreme exercise yields diminishing returns. Only 28% of Americans exercise enough. A Taiwan study of over 400,000 people found that exercising just 15 minutes daily was associated with three extra years of life. Emanuel identifies three essential exercise types: aerobic, strength training, and balance and flexibility training. He warns against contact sports due to chronic traumatic encephalopathy (CTE), a progressive brain disease caused by repeated head impacts. A 30-year study of over 100,000 health professionals found that 150 to 300 minutes weekly of moderate activity reduced all-cause mortality by 19 to 25%, with diminishing returns beyond that threshold. He warns that deconditioning occurs rapidly, with cardiac advantages disappearing within four weeks of stopping exercise.

The sixth rule, "Sleep Like a Baby," refutes the belief that sleep is wasted time. A study of 172,000 Americans found that poor sleep patterns more than doubled the risk of obesity, diabetes, and heart disease, and that good sleep was associated with an extra 4.7 years of life for men and 2.4 for women. Sleep consolidates memories, cleans toxic brain waste, and facilitates cellular repair. Emanuel recommends seven to eight hours for most people, with strategies including keeping the bedroom dark and cool and avoiding caffeine at least seven hours before bed. He endorses cognitive behavioral therapy for insomnia (CBT-I) as the first-line treatment over sleep medications and warns against consumer sleep trackers, which can cause "orthosomnia," an anxiety about sleep data that paradoxically worsens sleep.

In the afterword, "Be a Mensch," a Yiddish term for a decent, honorable, and useful person, Emanuel synthesizes his core messages. The six behaviors are mutually reinforcing: Exercising improves sleep, social support aids habit formation, and eating well supports cognitive function. Supercentenarians, people who live to 110 or older, most commonly attribute their longevity to family and friends rather than specific diets. Emanuel's final message is that wellness and longevity are only a means to a good life, not the essence of one. He returns to Franklin, who lived to 84 when average life expectancy was about 36, as the ultimate model: Keep challenging yourself, devote yourself to friends, and commit to making the world a better place.