Well, what foods do you eat? Are you getting enough vitamins? You may not want to hear it, but it really could be because of your diet. If you're net getting enough of certain things, like vitamin be for example, you're going to feel tired. Its not just any food that gives you real energy. Or not enough iron can make you tired. Since you don't eat much meat, where are you getting your iron from? And do you stay hydrated?
As crazy as it sounds, sometimes getting too much sleep can make you feel tired. And, I wish I remembered where I'd read it, but there's been at least one study that found that some people actually do better on less than 8 hours of sleep (I think it was about 6 hours of sleep they did best on).
I don't blame you for wanting to stay away from the energy drinks. The caffeine high is like a sugar high-temporary and addicting.
How much physical activity do you get? I've noticed that I actually feel more worn out when I sit around the house doing nothing all day then when I actually go and work out or get in some sort of physical activity, even if initially right after I feel tired, later in the day I feel much better.
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