by processed I mean food that has been ground or milled, or otherwise prepared to make it more digestible, rather than food that manufacturers add stuff to - although the 2 go hand in hand.
e.g. ground nuts are better than chopped nuts, which are better than whole nuts.
I think there are several avenues for you to explore - for instance you mentioned a nutritionist - in the UK we have dieticians - dietician's have to have a recognised qualification to be called a dietician, unlike the numerous TV diet doctors which we get on TV. I assume the states have something similar, and it may be better to get some proper nutritional advice from someone who is qualified, rather than from us lot of hacks
- if you have access to this then that would be my bet.
Bluesky mentioned egg, cheese, and nuts - if you like these then they are energy dense foods, easily cooked and mixed with other foods, and they have a small impact on blood glucose. In your case eating low-fat might not actually represent eating healthily.
what's your staple carb? How do you do with potato? another energy dense food, easily combined with eggs, and cheese - if you're thinking health conscious you can go for jackets rather than chips.
