i have that same problem and no matter how much i eat i cannot gain a pound - my step mom can feed me a 10 course dinner and would not gain a single pound
It could very possibly be a problem with your thyroid. I'd maybe get that checked out. But eating high fiber and protein and adequate amounts of unsaturated fats will help to keep you fuller for longer. A Registered Dietician would be the person to ask about that, though.
Math should be made illegal to kids under 18.
You're too good at math. You're adding all the numbers together and making a judgement day for your body.
Don't treat your body as a math formula or a lego construction kit containing 25 pieces that if put together in a proper order will allow you to experience joy.
Doctors absolutely love that approach because they don't know a **** and if you failed they'll blame you for not following the formula.
To lower your metabo[f*cking]lism - just go out, do sports, do dancing, do kissing and have fun.
Come back in 50 years if you still have the problems.
By all means - talk to doc and follow reasonably basic advice. At 90 pounds you're not going to be gone by the wind yet, and unless you experience total loss of energy (which would be a red flag) - just go along with your day.
Skinny girls are hawt.
If you feel physically bad or depleted or weak or sicklish - talk to doc - 100%
If you are feeling ok, but just 90lbs, while your best friend is double that - enjoy your ride - you're beautiful.
It sounds like you have an overactive thyroid. I'm pretty sure hyperthyroidism is very treatable, so I suggest seeing a doctor.
Ha ha that'll happen with age, dear.
But I would recommend eating more carbs and sitting on your but all day.