It's tough not only to cut back the calories, but to pack needed nutrients into the few calories remaining. Over several months you could accidentally end up with a severe deficiency of something.
Here's my fasting plan: 1 Meal/day 100 cals - 1 lb of Spinach 60 cals of tuna (1/2 a small can) 1/2 lb of cauliflower
That total comes out to about 200 cals and meets aboout 100% of 1/2 of all the micronutrients and roughly 50 to 100% of all the other micronutrients. The Tuna (Selenium,b3,b12,b6) nicely complements the Spinach (high in A,C,E,K,Iron, Magnesium). And you get a relatively high amount of protein and fiber (normalized for cals)
Also, you can use something like Crono-meter to measure all your nutrients.
And btw, just because someone is eating 2000+ cals doesn't mean they're getting all their nutrients. Most of the foods people eat are so devoid of any nutrition, they minus well not even count.
1. https://www.theguardian.com/world/2014/feb/04/castaway-jose-...
I miss the pancake batter taste of Soylent, don’t miss being fat.
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Too many carbs are too many carbs.