Brush ur teeth daily and cut down on sugar
Even having a cold or sore throat makes you more susceptible to dehydration because you're less likely to feel like eating or drinking when you're sick. So yes you can get dehydrated in the cold.
Back them cows and pigs were their food and they raised them for food along with farm crops. now we can just stop at any fast food place or restaurant and get processed/GMO food. some farmers still raise livestock/ domesticated animals but most people don't care to raise them anymore.
Potential trouble with the law, or social issues like losing your friends.