I go through lots more water, which seems to help with the energy level. May be a mind over matter thing, but I kind of look at it like "watering everything down". It especailly helps with cramps. I try for a lot of fish ( tuna for lunches and a good salmon for dinner) that seems to be better for energy than red meats, and white meats tend to make me sluggish during that time too.
hope this helps!