Diet is a surprisingly flexible thing. As long as you get the appropriate amount of calories, enough of the amino acids that your body can’t produce, and enough vitamins and minerals, it’s good enough. Prison food has all these, in spite of being the terribly unappetizing cheapest stuff that can provide it. It’s actually optimized to be the cheapest version of food that’s still nutritious because no prison wants to get in trouble for starving its prisoners.
Out in society, it can actually be hard to get a balanced diet without self-discipline because you can eat whatever you want, and what you feel like eating might not be balanced.
As for muscle mass, regular weightlifting will build and sustain it, and a prisoner has a lot more time to lift weights than someone out in society with the freedom to choose from an unlimited range of activities.
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