There are a number of culminating factors that can be arrayed in order of importance, but when ONE of those aspects is out of whack, then undesirable effects (such as extra visceral fat accumulation) can occur.
1. Dietary habits
2. Stress Management
3. Sleep Quality/Quantity (the right amount for YOUR body)
4. Activity level
5. Exercise
6. Self-Actualizing: The pinnacle of the hierarchy of needs! Doing things and living life in the way that you are able to be expressive and fulfilling!
*7. Supplementation: Not necessary, but this is the 'supplement forum'
I would consider these things the order of allignment for ME and to those I offer advice to. However, like I was saying before, you could have pretty much most your ducks in a row, but you need a balance. Physical manifestations are signs that something is usually out of whack and that you may want to (I advise) analyzing what's going on in your life and see if you notice any unusual changes that have been made in correlation with your abdominal adipose increase.
I would strongly advise against jumping into a stimulant as it bumps up cortisol even moreso and will further screw you up in more ways than you began.
Supplement-wise:
1. Lean Extreme
2. Andro Drive (has profound life management effects on me)
3. Relora/Sensoril is a great combo for coping with stress in a holistic manner and it is relaxing, yet non-sedating.
Hope I could help!