Your brain and body are likely running out of sugar, but it is not the _only_ energy source you can put in / harvest from your system. I recommend a small snack

Your brain and body are likely running out of sugar, but it is not the _only_ energy source you can put in / harvest from your system. I recommend a small snack on something healthy until your next scheduled meal. Repeat an hour later if you need to, but binging will throw your energy levels /hormones all over the place. Any new diet you try will have a two week or more adjustment period while your body adapts. This is normal, stay disciplined and measure results, then adjust. This summer I changed to a meal schedule that's one medium-ish sized meal every three hours with veggies, meat, and carbs (usually rice, I just love rice), and after an initial adjustment period of a couple weeks, my energy levels became much more stable, especially in the afternoons. After this adjusting to the above, I added coffee once at breakfast and once after lunch each day, which helps, but not in some amazing way. It's just a little extra energy boost in the mornings and afternoon.