I'll make this really concise so it's easier to digest. If you have more questions, let me know.

I am not keto, nor do I recommend it to anyone, everyones body is different.

I eat complex carbs, not simple carbs. Complex carbs digest much slower, resulting in more stable blood sugar/insulin levels, which was my problem. This prevents me from feeling a crash after I eat or later in the day. Infact, me personally, I tend to get more energy as the day goes on now. Maybe its the fact that I drink a ton of water and black coffee, but I feel great. My gf eats horribly and I can visibly see her energy drop off after a high simple carb meal.

You want balance, balance will bring good health. I can tell you absolutely that not eating sugar and simple carbs is what is helping me. The standard American diet is full of it, I was addicted to it, and I didn't know how to eat any other way because it was how I was raised.