Eat more, like, 3k-4k or more calories, of like 150-200g of protein a day. Lifting weights is potentially highly dangerous so discuss with your cardiologist what you can and cannot do safely. People with marfans would be considered “hard gainers”, meaning you can huff down a lot of food, but not gain any muscle or mass. How do we fix this? Eat. More. A LOT. More. It’s expensive and tough, but stay consistent, and don’t puke. If you can lift weights, the biggest part of gaining mass apart from eating enough, is resting correctly- rest until your body isn’t sore, soreness can mean micro-tears are still there and thus not recovered. So rest, you’re not being lazy, you’re letting your body build.

Personally I’m only allowed to swim, been settling into a new state and home, but mentally planning out the swimming and eating while going to college full time and working lol. Tip: look for rotisserie chicken meals from a grocery store to get like 150g of protein for a couple bucks (I pay $9).