A good article at 70’s Big about improving diet.
This doesn’t necessarily require you to exercise or be some big weightlifting or CrossFitting fiend or anything. What they present is just some good sound steps towards cleaning up your diet, for anyone.
What’s nice here is that people often feel that dietary changes have to be some sudden big thing. That’s usually a recipe for failure (pun intended). Drastic changes rarely work out.
But what they lay out here is a nice set of steps, like phase 1: stop eating processed foods, stop soda, limit (or drop) milk. Frankly for so many people, at least in western cultures, that right there would go a long ways.
This morning I was looking through the fridge and pantry to figure out some protein sources for myself. Didn’t see much that didn’t require a lot of work or eating steak every day (which is nice, but expensive). So I pulled 3# of ground beef out of the freezer and once they defrost I’ll cook them in 6 0.5# patties and put them in the fridge. Not a lot of work, but a lot of gain and facilitation, and a better solution than many other things out there.
Stuff From Hsoi 
Good stuff. I intentionally cook extras at dinner time (extra hamburger patties – in 1/3# increments, in my case, extra chicken breast, etc), and use the leftovers as a convenient source. Also, one handy, easily portable and storable option is tuna in a packet – packed in water or olive oil (for some extra fat content – avoid sunflower oil!). Good quality jerky is handy, too, though kind of salty.
Nuts are a good, handy fat source. I eat raw, unsalted almonds to some degree, and roasted unsalted macadamias are another favorite.
Whenever Wife goes to Costco, she stocks up on cans of chicken and tuna for me, which is a handy way to do things. But admitted, it all gets boring after a while… thus a little beef is good. 🙂
Jerky is a favorite, just expensive.