My wife is 10 months post op surgery and she has absolutely no energy, she is getting a vitamin b12 shot every two weeks, all of her blood test came back great even though she is not taking any vitamins, the only thing that was low was her vitamin D, my theory is she is not eating enough protein in a day, she normally eats nothing until dinner then dinner is next to nothing, she has lost 175 pounds from 353 to 181. Doing great in that scheme of things, light to no exercise. I'm guessing if she ate more during the day, did at least 15 mins of exercise and took a vitamin D pill it may help?? Any other suggestions? Thanks!!