Is this a healthy breakfast whole grain whole wheat cereal with vitamin d or almond milk with two eggs and a banana other days I eat a pbnj w/ banana?

HiCarb ↑esObesity DM. You're describing a breakfast which is high in carbohydrates; the grains are no longer hole, they have been ground into flour which dramatically increases their glycemic index ; bananas are a high glycemic index fruit. The eggs are fine yet everything you describe is low fiber content, a highly relevant issue given your stated history. All foods are marketed as healthy because this increases sales.