Prince Philip's Secrets to Long Life & a Favorite Recipe

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He followed a low-carb diet

While he hasn't directly shared his eating habits with the public, royal chefs have said that Prince Philip followed a mostly low-carb diet that focused on meats, fish, fruits, low-starch vegetables, nuts, seeds, vegetable oils and high-fat dairy. He also happened to be a very light drinker, avoiding alcohol and sticking mainly to beer for certain occasions. Both of these habits contributed to the fact that he was able to remain roughly the same size his entire life.