Paleo diet/low carb
Contrary to popular belief, best way to improve fatigue, cholesterol, and weight is by stopping high carb foods (grains, lentils, potatoes based items).
Also avoid milk protein
since it causes inflammation
Low carb foods: eggs, fish, meats, vegetables, avocados, some saturated fat
(butter, coconut oil), olive oil are very effective. Take vitD3 daily. You should notice a difference in 1 month