183.5 cm and 61 kilos here. I think I've got you beat. I've got the metabolism of a ferret, and I'm also very fidgety. (research shows people who couldn't sit still if their live depended on it are probably skinny)
Anyone got advice on gaining weight besides such sillyness as eating more? I eat four meals a day and basically snack all day long, plus eat loads of fruit.
No, it's not a medical condition.
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Yes, I saw a nutritionalist back in the 80s (before it was trendy), and I had the same complaint as you, Neutral.
Basically, remember the food pyramid at all times. Her advice to me was to add olive oil to salads and food in general. Olive oil is good because it is mono-unsaturated and can be eaten cold. Don't eat fried foods, heating oil chages its chemical composition (to polysaturated and worse, full of free radicals).
One of my favourite meals is pasta added to a plate of olive oil and tabasco (with salt and cracked pepper, to taste). Add half-a-dozen olives or some capers for some piquancy. (Not that I have a problem adding weight now, the metabolism tends to slow down after thirty. And my partner is a good cook.)
Oh, chilli is good for imcreasing your metabolism, so you might want to try it without.