A green smoothie for breakfast most days, i.e., one or two fruits, two or three green leaf vegetables--all from my diamond superfoods list--some ginger, lemon juice, compliant protein nuts/seeds/oil and larch powder, all mixed together in the Vita-Mix, seems to burn very cleanly and for over the over the span of a few hours. During this time my energy does not flag, but neither is it a nervous-type energy ... and then I eat lunch. (:
Hope this helps and, like Sahara mentioned, consistent exercise is such an important component. The more you work the body's muscles, the better the other positive things you're doing related to nutrition fall into place.