Diet is widely recognized as a critical factor influencing longevity and overall health, alongside exercise and sleep, yet efforts to improve eating habits on a broad scale have largely fallen short. Despite decades of nutritional education and prominent labeling on packaged foods, unhealthy diets continue to contribute significantly to chronic diseases in the United States and globally.

Experts in gerontology advocate for a comprehensive rethinking of how nutrition is addressed within healthcare and public policy. Recent research supports diets that emphasize vegetables, whole grains, nuts, and plant-based unsaturated fats, with moderate consumption of fruits and fish, low intake of red and processed meats, and minimal ultraprocessed foods and added sugars. Protein intake should be moderate but sufficient, with at least half derived from plant sources.

However, translating these recommendations into sustained behavioral change remains challenging. Physicians, who often provide brief, generic nutrition advice during routine visits, typically lack the time or specialized training to guide patients through effective dietary improvements. Similarly, registered dietitians face obstacles in securing long-term insurance reimbursement, limiting their ability to deliver sustained interventions.

To address these gaps, proponents suggest establishing a new category of healthcare professionals dedicated to healthy longevity. These experts would hold advanced degrees with focused training on the role of diet, exercise, sleep, and other lifestyle factors in extending “healthspan”—the period of life spent in good health. Working alongside multidisciplinary teams and leveraging artificial intelligence, such professionals would prioritize interventions with proven long-term benefits, rather than short-term or temporary solutions.

Among dietary interventions gaining attention are time-restricted eating (TRE) and fasting-mimicking diets (FMD). TRE involves limiting eating to defined daily windows, such as 11 to 12 hours of food intake followed by 12 to 13 hours of fasting. This approach is considered more manageable and safer than longer fasting periods, which can necessitate skipping breakfast—a practice linked to higher mortality. Benefits of TRE include gradual weight loss, improved metabolic markers, and better sleep.

The fasting-mimicking diet, developed at the University of Southern California and tested in over 40 clinical trials, involves consuming a low-calorie, low-protein, low-sugar yet high-fat plant-based diet for five days monthly. Early research suggests that periodic adherence to FMD can reduce biological age and risk factors for disease by triggering metabolic reprogramming and regenerative effects across multiple organ systems. Repeated cycles have been associated with fat loss without significant muscle loss, reduced inflammation, improved glucose control, and even regression of conditions such as diabetes and inflammatory bowel disease.

Beyond clinical approaches, experts argue that treating food as medicine requires broader systemic change. Consumer choices are influenced by complex factors including marketing, packaging, social norms, and industry priorities focused on profitability. To counter this, policy measures might include banning advertising of obesogenic foods to children, mandating warning labels on ultraprocessed products, and providing financial incentives to increase access to healthier options. Such steps could parallel subsidies and rebates that have successfully promoted renewable energy technologies.

Furthermore, reimbursement policies could be adjusted to better support healthy eating initiatives. Currently, insurance coverage often favors pharmaceutical solutions over dietary counseling or nutritious food, potentially perpetuating reliance on medications with temporary effects and side effects. Increased investment in businesses that improve availability of healthy foods, combined with enhanced nutrition education from an early age, may also contribute to shifting consumption patterns over time.

As Americans face rising rates of chronic illness and escalating healthcare costs, experts emphasize that addressing diet alongside other lifestyle factors could yield substantial public health benefits. Achieving meaningful progress may require coordinated innovation in healthcare delivery, regulatory frameworks, and societal attitudes toward food and health.