Lately i have felt like my legs always feel weak. They are fully functioning and I am still pretty active. Work out, play sports, etc. With that said, I have put on weight lately, so I am concerned about diabetes. Along with the weakness I feel dizzy from time to time. Not so much that I fall or even lose balance, just more of a light headedness. I am concerned that it could be something more severe, or is just a man turning 40 and going through some physical changes do to age and weight?