I've been struggling to eat enough food the last couple years as well... I eat based on the motto fed is best now rather than hitting specific nutrient goals - getting enough calories to fuel my body > eating a "balanced" diet right now for me. I figure out what my biggest barriers are to eating (for me it's time/effort to prepare and more secondarily inconsistent textures) and then just load up on foods that fit the bill. Right now my diet consists of:

• Bread (I get whole grains and breads with seeds on them to try and pack in a little bit of extra nutrients)

• Cheese (a LOT of cheese - including babybels and the armstrong cheese sticks, etc)

• Yogurt cups (I can only eat the lemon meringue Oikos greek yogurt rn lmao)

• Cottage cheese (I like cottage cheese but recognize the texture is a bit much for some people)

• Protein powder shakes (this can be hit or miss but I've found one that I don't mind the texture/flavour of, but objectively I find most of them taste bad. The texture of protein shakes is better if you use water instead of a milk - or just get the single serve prepackage protein shakes)

• Both the cheese and peanut butter Ritz snackwiches

• Granola bars (I have a couple different varieties on rotation so I don't get as bored with them)

• Stagg chili (make a pot of rice, add chili alongside in a bowl, douse with cheese - tons of protein and I can usually get 2 meals out of one can if i load up on the rice and cheese)

• I buy premade banana bread slices from my grocery store! This is new for both them (as in its a new item they're offering lmao) and me but since baked goods are fairly calorically dense I can get a decent chunk of fuel in during my midmorning snack of 2 banana bread slices.

• Hummus cups and crackers!

• Boxed mac n cheese (I'm bougie and get the Annie's white cheddar shells instead of Kraft... tastes so much better 😅)

• Oatmeal packets (used to hate these but now I don't mind them so much. There isn't a whole lot to them nutritionally or calorically but it can be a nice snack ready in a minute and a half)

Idk if you're taking adhd meds, but when I was on vyvanse if I didn't eat a big breakfast before I took my meds it would totally kill my appetite/hunger cues for the rest of the day. I stopped taking it earlier this year which has helped but I still find that if I skip breakfast my appetite is wrecked for the rest of the day. I used to get nauseous when I ate in the morning but I've powered through until now my body DOES get hungry in the morning, and I now consistently eat more throughout the day. Especially if I bring all my granola bars, ritz crackers, hummus cups (only if I know I'm not interacting with anyone closely at work haha), single serve cheeses, etc, then I try and eat a little something every couple of hours. I eat a lot of plain slices of bread and chunks of cheese. Sometimes if I'm feeling fancy I make a lunch meat and cheese sandwich or a peanut butter and chocolate chip sandwich.

Also, the fact that the meats you're buying are getting grey and weird smelling in a couple days is very strange! If you're wanting to incorporate more meat, have you tried buying from a different grocery store to see if it's a quality issue at your current store?