Hey Izzy,

I have a similar problem being 6'1'' tall at 155 lbs. I think my reason is stress of grad school and caffeine though. When an experiment starts I typically lose about 10-12 lbs. Do you have anyone in your family that has a similar body composition? It may be genetic more than your diet. Also if you do consider changing your diet for health reasons I would recommend seeing an RD (registered dietitian). They are not expensive for a consult and if you could find an RD student you could get a consult for free as a project of theirs smile.

I help teach some pre-med and med students and I know for a fact that medical doctors receive little to no training in nutrition unless it is their specialization. Even then I would trust an RD more. I would only trust an MD's advice on disease (such as hyperthyroidism) and general physiology (how the body works). Anything else like exercise and nutrition they are pretty much guessing.

An RD is trained and certified in nutrition topics. Good luck.

Cheers,
Nemo.
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You must be the change you wish to see in the world - MK Gandhi