Just went to something an old fashioned nutritionist told me: "Take a regular dinner plate. Divide it in half. Divide one half in half.
Fill the one half with veggies A(low starch). Fill one quarter with protein and one quarter with carbs/starches.
I also cut way back on carbs, quit eating chips and cookies and that sort of thing, knocked off the candy and ice cream, yadayada.
I've done this while being forced into a sedentary lifestyle by my back, knees, neck, and shoulders, so I'm not at all toned and I hurt all the time.
Oh, for the plate, remember that a serving of fish is 4-5 oz, and a serving of lean poultry is 4 oz and lean red meat is 3 oz.
I eat a lot of soups and stews, so I sort of do the above in my head while throwing ingredients in the pressure cooker.