sorry to hear bout ur back bro, u gotta remeber when a man puts on weight it goes to the gut area first, a woman goes to her hips,legs and love handles..so your weight around your gut is most probly due to excess energy that isnt being used that is getting stored on your stomoch, it doesnt always depend on your food intake it could be anything from matabolism to your thyroid glands. most likely its your routine and diet.

as soon as people see some fat on their bodys they automatically think about the gym or excersise, what they dont realise what makes more of a change and more rapidly is the diet, cut sugars out your diet, no takeaway food and the only drink you have is water and plenty of it, without excersise youl see a difference, then when you FIRST have your diet in a routine then start doing some cardio atleast 2 times a week, your sweating all the sugars out ur body and intaking less, your body then starts using the fat resources stored in your body/stomoch for required energy.