mary pat anderson: i like food. so one of the reasons that i've carried weight for quite a while is because of just eating too much and not caring enough about how i look. ralph cygan: today there are more than 100 million americans who are either overweight or obese. i think we have a very serious public health problem on our hands that we need to address as a nation. despite the fact that americans are more and more conscious about their weight, despite the fact that we have more and more so-called low fat foods and sugar substitutes, obesity is increasing constantly in the united states. i think it's fair to say we have an epidemic of obesity in the united states. today there are more than 100 million americans who are either overweight or obese. this is a disease and a condition which causes a whole host of important medical complications, so i think we have a very serious public health problem on our hands that we need to address as a nation. narrator: poor food choices, combined with increasingly sedentary lif