I think it has something to do with your body being exposed to cold. Even though you take a hot shower but the temperature of the water is lower than your body. So your body's normal response when exposed to cold is increase your appetite and make you feel hungry.

I just relate this to an article I've read at suite.101.com.

---quote---
According to a new study by the University of Chicago, "A strong correlation between climate and several genetic variations that appear to influence the risk of metabolic syndrome (Science Daily, Feb. 17, 299).

Basically what happens is your appetite and energy balance are effected by cold temperature. this causes us to move less, eat more and gain weight.
---end of quote---
Source(s):
http://www.suite101.com/blog/roserighter/cold_weather_chnages_metabolism

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