I have a large number of hot bath's and I stay in them upwards of an hour; during that time I sweat a lot(on the basis that my forehead is sweaty and salty) and after my bath I also sweat.

What I want to know is how much salt is excreted during an hour long bath, I know this will also be based upon my physiology(30,male,normal weight) but is there any standard a little like when you burn calories when doing a certain activity.

Also our of interest does having a bath increase the amount of calories you burn?  

Antiperspirant deodorants often claim to offer "24-hour" protection. What determines the length of time a deodorant works and how do they test for it? How does the chemical composition of the deodorant prevent perspiration?

Rowan Howell Lewes, East Sussex, UK

I understand that anitperspirants work by plugging skin pores with aluminum salts.  But it does not seem that blocking excretion of a substance would prevent the body from producing it. I envision blisters or cysts forming under the skin,perhaps merging to form a layer of somewhat nasty fluid.  In my case at least, huge volumes of the stuff would accumulate.  So what really happens?

When I eat certain cheeses (especially strong cheddar and old gouda), immediately after swallowing and before it reaches my stomach I get a strange sensation on my upper cheeks.

I feel a tingle and if i go for a second mouthful I get the sensation of sweating and very fine beads of sweat appear.

Why does it happen? Is it a tyramine response? Why is it so localised? - the location reminds me of a picture from an old anatomy textbook that described the position of the sensors on the face responsible for initiating the dive reflex.