Pick one small change and leave the rest alone. A full overhaul asks the most of you at the point when you have the least to give, and it usually collapses in the second week.

Water, sleep, food and digestion are not the boring preamble to the real work. When those are running badly, everything else you try has less to work with.

If your mood drops reliably as the light goes, that is worth naming as a thing in its own right. Seasonal low is more common alongside ADHD, and a light box first thing in the morning helps a lot of people.

Where ADHD and disordered eating meet, the pattern is more often bingeing, or bingeing and purging, than strict restriction. Restriction tends to travel with over-control, while bingeing travels with impulse and reward seeking.