I’m pretty sure those are the right answers
1)The lifestyle of a consumer will influence on his behavior and purchasing decisions. For example, a consumer with a healthy and balanced lifestyle will prefer to eat organic products and go to specific grocery stores, will do some jogging regularly (and therefore will buy shoes, clothes and specific products),
2)Cultural trends or “Bandwagon effect” are defined as trends widely followed by people and which are amplified by their mere popularity and by conformity or compliance with social pressure. The more people follow a trend, the more others will want to follow it.
3)The membership groups of an individual are social groups to which he belongs and which will influence him. The membership groups are usually related to its social origin, age, place of residence, work, hobbies, leisure, etc..
The main big one would be disease and infections. Trench fever, trench foot and trench mouth were common diseases people got when involved in trench warfare. Trench foot happens when the feet are exposed for long periods of time to cold water and mud. Trench fever is caused when body ice transfers from one place to another. Overcrowding conditions make this prone to happen. It causes headaches, sore muscles, skin lesions on the chest and backs as well as fever.
I hope this helps :)