Grain question

So I'm trying to cut something out of my diet, but I'm not sure exactly what it is. Whenever I stop eating bread or grainstuffs (or rice or oats) I have a ton of energy. It's great.

But is it cutting out the grain that might be doing this?

Also, should I be concerned? It's been like a week now and I'm showing no signs of slowing down. I'm sleeping well, pooping well (lol), and going to the gym every day and pushing my limits a lot. Is there a deadly, dastardly downside that I'm looking at?

For the record, I'm not doing this for paleo or SKD or whatever, but I'm happy and healthy. Am I missing something?

Thanks for listening!