One meal a day lower than recommended calories intake

Hey! I'd like to know what exactly would happen when I don't get enough calories while being on one meal a day for about a month, I've noticed today that my body is lacking energy despite me trying to eat well during that one meal altho I think the real issue comes with the amount of food I'm eating.. ps. I'm fasting for about 22hours and only using 2 hours of my day to eat that's why I can't eat much

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