Is this a quiz? Or are you concerned?

Ok, so you're going to make us guess.

A) You said you eat "small" - I'm guessing by this you mean volume. So, do you eat a box of butter every night?

B) Your body is probably in survival mode and your metabolism is probably shot from eating only one small meal per day. That means that your body hoardes the calories instead of burning them.

C) You get your calories via IV?

These are merely guesses since you didn't give us much to go on.

So? What's the answer?