Without knowing the answer choices i think his waist is normal but the BMI should most likely be examined.
There are multiple ways to burn calories such as doing workouts, running etc but if you would like to enhance it you could go on diets (Eat or drink certain foods such as Coffee that is known to boost the metabolism and burn more calories) You could also slowly start to disinclude certain items in your fooy pyramid such as dairy (or lessen the intake of dairy and fatty foods).
Be Mindful of Your Own Reaction,Use Positive Self-Talk, and Debrief.