Normal body temperature should be around 36 degrees, but we drink so much cold water, beer and have a lot of food taken from refrigerate directly. The temperature of the food from refrigerate should be around 10 degrees.
It takes so much body energy to warm up this cold food and drink. They do not get warmed up directly. The energy your body can produce in a day is limited. The more cold you have had, the more energy your body has to consume to warm up the cold in-takings so that in taking cold could come to the body temperature.
When your body uses much energy to warm up the cold, the job for other body function remains undone, for instance, to take away the waste. The waste of metabolism covers the whole body, not only is the waste in stomach system and bladder, but there is more all over body.
This remained waste causes so much trouble for our body to handle, but our body has not energy anymore, which leads to so many health problems.
You might not think so, just do a little test.
Prepare two cups of water, one 10 degrees, other 36 degrees, then wash two plates with some butter on with these two cups of water and see the difference between them.