People often argue that being overweight is hereditary. Despite exercising they still cannot lose weight, their parents are overweight and therefore it must be genetically linked. Whilst this has been treated with scepticism by medical professionals for many years recent research shows that there is an influence.
Research on twins has shown that body fat distribution is at least 60% inherited which means that we will stay roughly in our body shape and fat profile for life. Furthermore research also indicated that how well the body responds to exercise is also influenced.
Although this shows that their is some link to say being overweight is hereditary is not the case. Both of these factors influence your own weight balance of how many calories and how much exercise you need to maintain a healthy weight.