You cannot 'spot reduce.' If this were true, then people who chew gum alot would have slim jawlines.
He'll need an over all healthy diet plan, with plenty of cardio and strenth training.
The "spare tire" around the belt area are love handles, not saddlebags. Saddlebags are where your leg meets your butt, on your backside.
You mentioned 1000 calories a day??? That is insane! His body is probably starving and clinging on to every ounce of fat because his body is in survival mode.
I just found an online caloric need calculator. For his age, height, weight, I got a total of 3,000 calories a day for moderate activity.
And keeping ajournal of everything he ate can really help open his eyes on what he's truly eating.