Just to say that the neutering does not work straight away, the hormones carry on getting higher, so can seem that they are getting worse, and only calm down after a while, so the issue arising may not be the food , it may be that your puppy needs to adjust to the situation.
If it does not get better after a while then it may be the food but it may be you will have to wait until a few weeks have passed.
I used to puppy walk for Guide dogs and have had a few that seem to go off the rails when they are neutered. It does pass, but only time will tell.
I hope that helps and your puppy calms down.