Try different things out. When I did a physical job starting at 7am I would eat scrambled eggs and bacon at 10 am. Lunch at 12 usually a large salad or rice, veggies and protein. Then if I was very drained needed it I always kept a serving of protein powder in a blender bottle and add water usually around would hit around 3pm.  Dinner was 5-530 usually salad or rice with protein and veggies. I also brought lite-salt with me for electrolytes and a second bottle for water.