Stress causes the release of a hormone called Cortisol which, amongst other things, causes fat to be deposited around our tummy. The bad thing about tummy fat, is that it is not on the outside. It is actually on the inside, around the organs. So, no amount of sit-ups can touch this fat…it can help tighten abdominal muscles (especially for those who just put to bed) but it won’t get to the fat around organs (visceral fat). This fat is associated with some disease conditions like Diabetes Mellitus etc. So, reduce your stress consciously by figuring out how to better cope with your sources of stress or even eliminating the stresses that you have control over. It’s your life after all.
Here’s what Harvard Health thinks. https://www.health.harvard.edu/blog/stress-eating-five-strategies-to-slow-down-2019082617620