Actively exercising only burns slightly more calories than just sitting around existing does.

CICO works to an extent, but human bodies are shockingly efficient machines. What you eat is important, why and how you eat are important. Losing weight and keeping it off can be hard.

Adding exercise is great for a lot of reasons. If you aren't getting regular exercise you really should. But one of those reasons is certainly not weight loss. You might even gain weight.