Is it true that crunches and sit ups dont help you lose weight n your stomach?

Yes if you body fat percentage would be too high no matter the number of crunches and sit up would not reveal the abdominals.

This is what I have as my summary and recommendations after all these years

Be it Keto, Intermittent fasting, Atkins, OMAD and excluding the hormonal stuff that each diet has. The diets would generally require a higher expenditure as compared to intake for it to work.

What has been your experience of matrimonial site?

Going anonymous because it's about a fraud profile on a matrimonial website.One word: Terrible.The entire business is full of two-faced frauds. It's a terrible place to be for a girl (especially), who becomes the target of perverts that come in all shapes and sizes over there.So only a month back my parents opened my profile on Bharat

Why can't I lose weight if I am lifting weights for 2 hours a day everyday?

I would need more information about this weight gain before I can give a real answer, but assuming the weight gain is related to fat rather than muscle gain (it's possible to gain weight and look more defined in the mirror) and

How does intermittent fasting increase metabolism?

Intermittent fasting in of itself does not increase metabolism unfortunately. The only ways to improve your metabolism is to exercise more, build more muscle, eat more food, or receive an additional organ.Many so called intermittent fasting