India, Aug. 3 -- How inspiring does it feel when we see a friend or even a celebrity shed the extra pounds to reveal a fit and toned self. They work out at the gym, keep their diet in check and impress one and all with their dedication. However, the lost kilos do not always stay off. Many often pack on those pounds again, often in no time at all. Why does that happen and why do some people find it so hard to stay lean and fit?

Gastroenterologist Dr Palaniappan Manickam shared a video recently on Instagram on this topic. The California-based doctor explained why individuals often regain weight after dieting, attributing this phenomenon to fat cells that shrink but do not vanish, similar to deflating balloons.

"Have you ever wondered why ...