My friend is trying to lose weight but has severe lower back pain. what are his options?

See below: Losing weight may improve his back pain. Eat healthful meals of lean protein, good fats, fruits & veggies, whole grains; avoid junk food, soft drinks, high glycemic index carbs. Control portion size by using smaller plate & not going back for 2nds. Pool exercises are good for back problems due to low impact on joints/back. Aim for 2 lb/wk weight loss.