David, aged 14, and John, aged 19, were both obese and had many health problems associated with the condition. They claimed that this is the result of eating regularly at McDonalds restaurants. They sued McDonalds Corporation for selling poor diet food. In some places (or nations), salads and fruits are not on the menu. McDonalds staff are also trained to offer customers the option to supersize meals with additional fries and soda. Do you think David and John's claims are legal? Critically discuss whether McDonalds should be blamed for causing obesity and other related ill-health problem using appropriate theories.