u/trulynotafan

I'm 5'9, 19 yr old male, current weight is 53 kg.

I've recently started bulking as I'm underweight. My calories intake before was \~1200 (yes that quite low, I ate like two times a day, I don't really like eating a lot) but now my daily calories are around \~2500. I wanted to know if this sudden jump is okay or causes any side effects. I haven't noticed anything other than my stomach being a bit upset and light belly pain every week that lasts around 20-30mins.

I was sedentary before, but now I've started gym and the workout is pretty strong.

A detailed description of my intake daily is:

\~2.5k calories, \~150g protein, \~40g fiber. I have around 5 meals, 3 before gym and 2 afterwards.

If I'm doing anything wrong please guide as I'm a noob.