The U.S. military is considering putting its elite Navy SEALS on the high fat, ultra-low-carbohydrate keto diet because it may help them stay underwater longer, according to a June 14, 2019 Business Insider article.
The keto diet induces a metabolic change called ketosis, which causes the body to burn stored fat as energy rather than blood sugar. One of the side effects of the process is that it changes the way the body handles oxygen deprivation. David Ludwig, professor in the Department of Nutrition at Harvard T.H. Chan School of Public Health, explained in the article that ketosis reduces the amount of carbon dioxide produced by the body in relation to the amount of oxygen it consumes.
The buildup of carbon dioxide in the bloodstream is what triggers the need to breathe, he said, so being on the keto diet could enable someone to breathe less often.
The above article would lead one to the conclusion that most people with sleep apnea which causes hypoxia would benefit from a keto diet.
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I was discussing this diet with someone I’ve known for years recently because I knew they had been on it for a long time with good results. However the person told me that their doctor had convinced them to come off the diet, after the person developed prostate cancer that ultimately required surgery.
The doctor, who is considered top notch and works for a major medical clinic, said overabundance of protein could cause that. I have no idea but it was interesting, especially since my diet is high in protein already, but my PSA has been historically low (but slowly rising).