He needs to go on a diet that is high in protein, moderate fat and low carb. Try somthing lihe this:
Goal: Gain Lean/ lose fat ? 3000 Cal
Meal #1
2 whole eggs + 4 egg whites
5 oz. 93 ? 96% lean ground beef, chicken or turkey breast
1/2 cup oatmeal (before cooking)
1 TBS Flax Oil (add to eggs and/or meat after cooking)
Meal #2
Protein Drink: 2 Scoops whey protein, 4 TBS whipping cream (2 oz.) or 2 TBS flax oil or natural-style nut butter, and 12-oz water
OR
4 oz chicken breast and 4 oz beef, 1 apple
Meal #3
8 oz. chicken (before cooking)
6 oz. sweet potato or 1/2 cup cooked brown rice
1- 2 cups vegetables (broccoli, etc.) or salad with 2 TBS. Low Cal Dressing (fat free, sugar free)
Meal #4
(same as meal #2)
Meal #5
8 - 10 oz. 93% or more lean beef, chicken, turkey, fish and very lean steak
2 cups vegetables
1 TBS Flax Oil
That should lean him out and preserve muscle without T3. I wish people would show more disipline and not rely on drugs right off the bat.
Peace and I hope this helps