Some of the common ways girls get fat in stories are through unhealthy eating habits like snacking constantly on junk food. Also, they might have a sedentary lifestyle, spending a lot of time sitting and not being physically active. Sometimes, certain medications or medical conditions can also cause weight gain for the girls in the stories.
Well, it could be due to a combination of factors. You might have had an irregular eating schedule, lots of sugary drinks, and spent too much time sitting instead of being active. Stress and lack of sleep can also play a role in weight gain during high school.
No, they aren't always accurate. These 'women get fat stories' are more like generalizations. Consider the story of women gaining weight as they age. There are many fit and healthy older women who maintain their weight through proper diet and exercise. Also, the claim that certain medications always cause weight gain in women is inaccurate. Some women may not experience any weight changes while on the same medications. It depends on individual differences in how their bodies respond to various factors, not just the simple narratives presented in these 'women get fat stories'.
Yes, they can. Sims in Sims Life Stories have a body system that can be affected by their eating and exercise habits, just like in real life. If they eat too much junk food and don't exercise, they will gain weight and become fat.