Because it requires constant supervision, otherwise the person will simply get hungry and go eat something they ought not. This is expensive.
Even if you didn’t go the total starvation route, supervision is ultimately the limiting factor- put a person in a house with pre-packaged food of, say, 1200 calories a day and tell them to only eat that would work great. Except that pizza places deliver.
when you do not eat enough calories that makes your body believe that you are going through hard times and it will lower your metabolism to preserve the extra energy it has stored up making it harder to loose the weight. also fat alone is not enough for your body to function properly. you need fiber, vitamins, and minerals. if you want to burn fat in this way i would recommend trying out the keto diet. you can still eat a lot of the food that you like but it cuts out carbs meaning the only source of energy your body gets is fat which will make it burn it’s own fat stores to maintain its energy
You’ll lose weight at first, but it’ll trash your metabolism so when you start eating again you’ll gain weight and have a hell of a time trying to lose again. I lost over 150 pounds from gastric bypass, maintained for 7 years. Then started eating a little more and ended up gaining 50lbs. Now I’m back to eating a bariatric diet and I’ve only lost 9lbs in 6 weeks. My surgeon told me my metabolism is slower now so it’ll always be hard to lose from now on. And that the only way to lose is to basically starve myself. If I eat 1200 calories, I GAIN again.
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