I want my GF to lose a bit of weight....

Pretty sure I know what he was told by his GP, but still, I'm sure you know better...

Why are you referring to yourself as "we"?

I'll tell you this now, find a skinny person that is actually hitting their calorie intake requirement for weight gain and STILL staying skinny and you will have broken physiological systems as we know them, thermodynamics and in fact, plain logic.

Sorry love I just cant agree with you on this, my boyfriend is underweight, he's 6"6.5 and struggles to maintain his weight, I give him 3 protine shakes a day, along with making him eat breakfast, buying him sweets, and keepiing count of his caloire intake, its been worked out that he needs about 3000 kcals at rest to just maintain his body. When he does sport I have to feed him about 250g of pasta covered in thick cheese sauce with a protine shake.
No he's been to the doctor theres nothing wrong with him that would affect his inability to gain weight.

Things are not always black & white, theres always exceptions to lifes rules.

I'm just saying, in the majority of cases, skinny guys don't really have a reason not to gain weight (outside of perhaps a freak metabolism that's usually because of a medical condition anyway) and if they're using the excuse of high metabolism to cover up for their inability to eat enough and if they THEN complain about their weight, then it's completely their fault. You are what you eat after all.