I am a healthy 58 year old man. Around the first of September 2008, I noticed a reduction in my energy level. Nothing else has changed, just the loss of energy. I sleep well, eat right, no appreciable depression issues…I’m just "weak", and have a loss of stamina. I take a Stresstab multivitamin daily and get exercise. Any ideas??

im too tired in the morning and i am thinking that if i eat eggs in the morning.. will that raise my stamina to stay awake in class?
or at least fill me up so i wouldn’t have a growling stomach?

I am 5’8" 135 lbs, and I haven’t been taking care of my body lately. I would really like to clean out my system to help with my skin, digestive tract, and stamina, but I fear losing weight if I cut out such things as carbonated beverages that provide a good portion of my caloric intake. Are there any detox diets that can be followed without weight loss and healthy food substitutes that will sustain weight?