Weight loss is always trendy. Experts speak about fat loss (and not weight loss).
Fat is a stored energy. The increase of the body fat percentage is a symptom or an indicator of an underlying cause.
The underlying cause is simply the non utilisation of energy which ended up being stored.
In other words, the real underlying cause is a weak muscle.
Therefore, instead of preaching weight loss (or fat loss) which is everywhere on social media, the focus should be on muscle strengthening.
Pump that muscle and let it take care of body fat.
Muscles are the anti ageing (or ageing gracefully) weapon!