I am really really hot (temperature wise, I'm not that conceited) and am constantly sweating. How can I lower my body heat throughout those toasty summer days?

Go to the mall.

a cold shower helps.

Would diet/exercise have anything to do w/ it?

I’ve used these
I’ve even activated them partway and put them in the freezer. The inner seams pop a little, but they still work. They are great for migraines when frozen. I haven’t used them by just soaking them and wearing them, though, I alway freeze them and put something between my skin and the wrap if they are too cold.

Eat light meals.
Drink just water and lots of it.
If you have to, wear comfortable, leather shoes that breathe. Otherwise none or flip-flops
Do your task with a Jamaican attitude. No worries and seriously easy going.

And well if you’re in a fit shape and exercise regular. Your body adjust itself better.

Drink, drink, drink your water. Doesn’t that seem to be the answer to everything these days? But seriously, drink your water. Try to stay away from drinks that have a lot of sugar in them (like soda), they don’t do anything for you.

I don’t know where you live, but I can agree it’s hard to stay cool lately. Here I am living in Florida and nine months pregnant! I have noticed that I feel better when I drink enough, but even so, it’s still too hot. I just stay inside as much as possible. At night I have a fan at the foot of the bed and one at the head of the bed as well as the a/c running. It’s crazy!

Good luck.