Calorie counting. Work out what you need for the day, count your food to match but spread throughout the day.
I’ve cut my food intake right down now I don’t use as many calories. Literally my lunch is a sandwich, an apple and a banana. That’s it. Then an evening meal. To complicated it further I start work at 1am so don’t fancy breakfast then surprisingly 
so I end up haggling my fruit about 5am then my sandwich about 10am then my evening meal about 4pm.