I learned my lesson - almost the hard way, and quit trying to be a hero and play through wooziness if I experience it, during heat. I'll still go out and play, and don't carry but walk with my Sun Mountain speed cart. But, what Chris Flamion said about the balanced nutrition and hydration is very interesting. Today it hit 97* and about 65 humidity that caught us a little surprised not expecting it. We played a 3some, and I was the youngest at 62yrs, and another guy who walked with a battery powered caddie cart 64, and Mr. Ironman, Steve the Marine who CARRIED!!! Steve turned 80 Christmas, and he had a very rough winter with Pros Cancer radiation and complications. I had to keep yelling at him to keep drinking water today. We finished and drank 3 pitchers and all felt pretty good, Steve being the freshest!
But, if I get woozie anymore like I felt just before I got serious heat stroke 3 years ago, I will stop and quit playing. What my body went through in the aftermath was fascinating but alarming. The Doc told me that heat stroke is a progressive thing when you get it so bad it effects body functions and seizes up muscles and you black out. He told me effects get worse each time and to never push it again, or it may be the last round, DNF! I don't love golf that much!
But you gotta see Steve to believe the guy.