Not a diet so much as a whole life change.
I recently started a nutrition/weight loss/exercise program. For the first week, I'm on a balanced 1000 calorie a day limit.
Each afternoon I power walk (keeping my heart rate up) two and a half miles, part of which is 200 steps up a tall hill. I am absolutely exhausted when I get back and for the rest of the evening ... not just tired, but don't even want to stand up exhausted. I find I am tired in the mornings too. (Not severely though.)
I am a male, 270, and would like to lose 70 pounds. The whole thing is working beautifully and the weight is coming off. I'm just wondering about the tired thing.
(I should have mentioned - the second week, I go up to 1800 calories per day on the program.)