response: A healthy diet is one that gives the body essential nutrition.
original_response: Hopefully.  As long as you get the essential nutrition, like fluids and protein, you should see decent results no matter what.
history: I have quite a lot of energy, but I know some people just aren't as lucky. Is their a medical condition for being constantly tired? There is a condition called chronic fatigue syndrome in which people have long-term fatigue in a way that limits daily activity. That must be awful. I wonder what causes it. Depression perhaps? I don't think the cause is fully understood.  It could be genetic, could be biological, or it could be psychological. Well, I guess the medical profession had better get to the bottom of it. It must be destroying people's lives! I wouldn't know, but there is some evidence that cognitive behavioral therapy combined with increasing activity can help. That makes sense. If a person exercises it often brings ones energy levels up. There also hasn't been any evidence of any serious bad effects. That is good. A healthy diet, positive thinking and exercise are things we all need. Perhaps that's what's needed.
knowledge: A healthy diet provides the body with essential nutrition: fluid, adequate amino acids from protein, essential fatty acids, vitamins, minerals, fibre and adequate calories.