Weight gain; is doctor being irresponsible?

In my experiences in trying to lose weight, the killer for me is carbs. Generally it is bad carbs such as cakes, biscuits and too much bread. But if you are trying to gain a couple of pounds I would recommend this food group, but keep it in balance with the rest of your meals. Perhaps having pasta or rice once or twice a week. Likewise more potatoes. These are starchy foods which are converted into energy by your insulin. If they are not used up immediately by the muscles then they are stored as fat. Hence, when I am dieting (which seems to be all the time), I try and limit the intake of carbs. Alternatively, muscle weighs more than fat, so perhaps if you increased your protein intake, with more meat and fish, and then did some exercise (weights) then you would develop more muscle tissue. I'm not suggesting going overboard, but I would imagine that these ideas are better than stuffing yourself with cream cakes.

I had to look up how stones converted to pounds since I'm not familiar with that system of weight. You're 105lbs according to what I found, at 5'3" that's not very underweight- a bit under but not severely. If your doctor suspected you had an eating disorder, she should help you find help for that- suggesting you eat cake wouldn't help you if that were the case. If you're having medical issues arise because you're slightly underweight- missing periods, weak, low iron, funny blood sugar readings- then perhaps she should send you to a nutritionist to talk about your diet & come up with healthy ways to help you gain a little. If you're planning on trying to conceive soon, you may want to put on a couple pounds (again by eating healthy). But by the sounds of things, this is the weight your body wants to be when eating right. Even if you were very underweight, I can't see any benefit to gaining weight through eating junk. Refined sugars, unhealthy fats & white flour is usually what cakes are made of, that's not what a body needs for fuel- an occasional snack is OK, but not all the time. If you wanted to gain weight (& again I don't really see why your doctor is making a big deal out of it) I'd suggest weighing & measuring the foods you eat already. Make sure you are getting a full serving of what you eat, and enough servings from each food group. If you are already, I'd probably tell my doctor to back off about it.