I am someone who found keto worked really well for me. About 5 years ago, I did keto for about a year. Wasn't really doing it for myself to lose weight but my then gf wanted to do it and went along with it for the other benefits (such as increased mental clarity).
I am more of a slender build but did have visceral fat. At the time I started, I was probably around ~195lbs, 6'1" and was in the latter half of my fifties. Played pretty competitive sports up until my mid-twenties but switched to exercising 4 - 6 times a week ever since then.
Having never dieted before in my life, I was quite surprised at how easy I took to it. The only sacrifice I had to make was some food that I could no longer eat but it was replaced by other tasty foods and due to the satiety of fats, never felt like I suffered from hunger. I can't recall precisely but I was burning somewhere around 2,300 - 2,500 calories/day (as per my fitbit) and what I was ingesting wasn't much different per my calculations (but I wouldn't say that I was super diligent about our measurements so could easily been off on that).
Ended up losing 25lbs in six weeks and actually ended up having to up my calories as my gf thought I was looking too gaunt. Did that and gained back five pounds. After the year of keto, I have been maintaining a lower carb diet that doesn't put me into ketosis but I've maintained the same weight; basically the same weight I was shortly after high school. Not bad for someone in their early sixties, I guess, but the best part is, I don't really feel like I'm sacrificing anything. I'm eating healthier while enjoying food and, somewhat importantly, have lost my craving for sweets. I was quite a sugarholic before. Plus, have tonnes of energy and don't suffer any food crashes after meals. Just had a full round of cardiology test and my results are extremely positive. And the visceral fat is gone. I dare say that if core weren't my least favourite muscle group to exercise, I could relatively easily get a six-pack.
YMMV
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