>regular old high protein food

You don't need to eat "high protein food" to get adequate protein.

Let's say an 80 kg moderately active man needs to eat 2600 kcal/day to maintain body weight. According to current guidelines, that man needs about 0.8g/kg of protein per day, or 64 grams per day.

White bread has about 2.6 grams of protein per 77 kcal.

https://tools.myfooddata.com/nutrition-facts/174924/wt1

You have: 2600 kcal / (77 kcal / 2.6 grams)

You want: grams

* 87.792208

/ 0.011390533

That works out to about 88 grams of protein per day eating nothing except white bread.

It's difficult to not get enough protein unless you're eating too few calories overall.