Tech execs like Bryan Johnson and Sam Altman are optimizing their diets to live longer. Here's what experts say to eat to expand your lifespan, from blueberries to red onions.

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Some billionaires, like Elon Musk, opt for a donut for breakfast. Others, like biotech entrepreneur Bryan Johnson, methodically prepare smoothies with compounds like creatine, spermidine, and collagen peptides, and consume copious amounts of vegetables. Tech billionaires clearly don't have identical diets, or even the same goals for their health. Still, those like Johnson aren't abiding by fastidious nutrition plans simply to stay healthy — they're aiming to live longer.