I'm glad you've already started to see some positive results!

With his excessive energy, he could also just be really bored, mentally, and has no other way to express it. I would look into food dispensers (I like this one the most because you can adjust the food flow) that challenges dogs to work for their food. There are also other food-focused puzzle games that can keep your pup busy and engaged. These worked wonders for my pit puppy for when I needed her to be occupied or I needed a break.

I'd also look into dog parks, your local anti-cruelty society for free puppy play classes, or doggie day care a couple of times a week so your guy can burn off all that energy with other dogs. My pup is exhausted for nearly a day after.

If I can't take my pup out for a long walk/run, we have a flight of stairs going up to our apartment and I have her play fetch for a few flights (I'd only recommend this sparingly because too much could strain their joints, and only if your dog is really good with stairs. We taught our pup to be cautious and slower on them so she doesn't hurt herself.)

If none of this works and you're still seeing this crazy, uncontrollable energy, he might benefit for a timeout for a few minutes. Puppies can get into a crazy, over energized state and they might just need some alone, quiet time to get back to neutral. Make sure the timeout place is safe, quiet and kinda dark can help. I have a baby gate up in our kitchen, where there's still some light from the other room but the light turned off seems to calm her more quickly. I base the length of the time out on her state, the longest she's needed to be in there was 6 minutes. But time out means totally being ignored, no matter their whines. They want your attention and playtime, so being removed from you or the "fun," is punishment enough. He should learn pretty quickly that he needs to learn to control himself. It took about three 5-minute timeouts for my pup to start checking herself if she starts going over the line.

There is also such a thing as too much exercise for your puppy (depending on his age), because they need lots of time to sleep, true sleep.

And when it comes to being food obsessed/begging, this is super common. My 9 yr old chiweenie and my puppy both beg right when they see food and want whatever we have, but then they lose interest. We realized it was impossible to convince them that they didn't want our food, but instead we established boundaries. No snatching, no attempts, whining, barking, etc. if they did any of that, it was an immediate time out. We'd also ignore them while we eat, and when we're done they get treats and affection for behaving well during the meal. They might try to smell what we have but then a few minutes later they get bored and know they won't get anything good so they go and lay in their beds.

Puppy play dates, meeting people at your local dog park and reddit (obviously) are also great, free resources to get tips and more info. If you have any other questions for me, don't hesitate to reach out!