Stress slows down fat loss on the stomach. Visceral fat is associated with an increased risk of heart attack, high blood pressure, stroke, arteriosclerosis, diabetes, thrombosis, Alzheimer's and even cancer.
If your stomach just doesn't want to get smaller despite all your efforts, it could also be due to a fatty liver. A regular check-up with a doctor will bring clarity. If you're now looking at your stomach in frustration, you should incorporate more relaxation into your day in addition to exercise.