What is a positive feedback loop?

Positive feedback is a process that occurs in a feedback loop which exacerbates the effects of a small disturbance. That is, the effects of a perturbation on a system include an increase in the magnitude of the perturbation.

Artificial and low-calorie sweeteners do not appear to help people lose weight — and in some studies are linked with weight gain, diabetes, and cardiovascular issues. When you trick your body and feed it non-nutritive or non-caloric sweeteners, it gets confused. Artificial sweetener stimulates your appetite and makes you want to eat more. Artificial sweetener can even slow your metabolism down, causing more weight gain.