Résumé de The Longevity Paradox

In *The Longevity Paradox*, cardiothoracic surgeon Steven R. Gundry argues that aging and most chronic disease stem from the same root cause: an unhappy gut microbiome. His central framework divides human genes into two competing sets—an ancient "survival" genome that favors fat storage and inflammation, and a newer "longevity" genome geared toward repair—and contends that modern diets tip the balance toward the former by feeding the wrong bacteria. Drawing on his clinical practice, he implicates lectins, certain plant proteins he claims damage the intestinal lining, along with animal products rich in Neu5Gc and carnitine, which gut microbes convert into TMAO, a compound linked to cardiovascular risk. He also invokes "molecular mimicry," in which bacterial proteins resembling human tissue may trigger autoimmune reactions. The book prescribes what Gundry calls a "Paradox" diet: restricted eating windows, periodic fasting or fasting-mimicking regimens, and a largely plant-based menu emphasizing cruciferous vegetables, resistant starches, inulin-rich foods, and fermented items like kimchi and sauerkraut, while limiting meat, dairy, and high-lectin grains, legumes, and nightshades. He promotes foods he calls "Gundry-approved," such as yacon syrup and sorghum, and supplements like akkermansia-boosting compounds, though some recommendations outpace mainstream evidence. Chapters examine the gut barrier and "leaky gut," the role of autophagy and stem cells in tissue renewal, and the notion that aging is a communicable, diet-driven process rather than an inevitable decline. Reviews, including in *The New York Times*, noted that his claims about lectins remain debated among nutrition scientists. The book followed his earlier *The Plant Paradox* and was published in 2019.