Final answer:
Liam and his family make poor lifestyle choices such as consuming fast food, leading a sedentary lifestyle, and lacking awareness about the impact of their choices on their health.
Step-by-step explanation:
One poor lifestyle choice that Liam and his family make is their consumption of fast food several times a week. Fast food is often less healthy than other meals and can contribute to weight gain and obesity, which in turn can lead to various health problems.
In addition, Liam and his family may have a sedentary lifestyle, spending more time on activities like watching TV or using the computer rather than engaging in physical activity. Lack of exercise can also contribute to poor health and weight gain.
Lastly, it is mentioned that Liam is only slightly overweight and has no major health problems, which suggests that there may be a lack of awareness or concern about the impact of their lifestyle choices on their health.