I'm beginning to think that the starting point for any dialog on health (especially in the elderly) begins with the facts that we eat too much and don't exercise enough (and everything else is a sideshow?) I'm retired and on a modified keto for about 6 months. What one notices is how hard it is to avoid carbs (since veggies and fruits for instance have them), and how fiber and protein come in different packages (so you have to eat 2 different things to get enough of each). I try to get 30 gm of fiber and 75 gm protein daily by eating berries, veggies and my "apple banana protein shake", along w egg/cheese/unprocessed meat kind of things. It helps that I can "subtract my fiber count from my carb count". I feel great but I attribute most of that to added exercise and less overall calories. I suspect that since we eat too much, veggies are good since they are "a bunch of nothing" (water and fiber) while fruits are a "sugar coated bunch of nothing" (sugar but enough fiber and water to offset), which all means that you're fooling yourself into eating less calories. I can eat dairy and poultry guilt-free, but I often wonder about beef and pork (do the additives offset the non carb benefit?) However I probably couldn't get my protein wo it. I lean heavily on salads and nuts (probably too much). You hear about micronutrients in fruits/veggies but I'm rather skeptical. I believe coffee, tea, turmeric, statins, sildenafil, etc are natural mTOR inhibitors (appetite suppressors) and anti vascular restrictors (helpful). I haven't lost much weight but I've added muscle, Crp very low, at 67 I sleep well, no joint pain. I sure as heck hope this all works into my late 70s!