I find that I tend to drift into an pseudo intermittent fasting routine. I usually eat one large meal a day, in the middle of the day. I try to avoid anything t

I find that I tend to drift into an pseudo intermittent fasting routine. I usually eat one large meal a day, in the middle of the day. I try to avoid anything that has sugar, carbohydrates (though I do eat a decent amount of rice), dairy, stuff like that. If you eat bread in the morning or drink coffee/tea/juice with sugar, cut that out immediately. That is probably a big contributor to your tiredness.