Actually, people tend to choose restaurants based on the size of their food portions. Young and Nestle propose education and public health programs as a solution to obesity.
A similar viewpoint is shared by David Zinczenko in "Don't Blame the Eater." Zinczenko talks about the growing rate of childhood obesity and how it is connected with the fast-food industry. He brings up the fact that there is more fast-food available than there are healthy food places. For example, he states that you can drive down a street and find more fast-food restaurants than you can find a place that sales a simple grapefruit. Zinczenko goes back to talk about his own personal childhood experience. He came from a broken family and was often left to find his own means of food, which led him to make poor decisions and would end up at fast-food restaurants like McDonald's and Taco Bell. Zinczenko learned to manage his dietary choices and self-control as he got older and luckily realized that his old habits were leading him to a lifetime of trouble filled with disease because of obesity. He makes the bold statement that today's youth might not have the realization he had and will not be able to change the unhealthy path they are on.
In contrast, in "What You Eat is Your Business" by Radley Balko, he doesn't necessarily disagree that portion sizes are larger today or that fast-food is highly available, but he does not however, agree that obesity is caused by the fast-food industry. Balko believes that each individual's health should be entirely up to them. He believes that everyone knows exactly what they are eating and can make their own decision on whether or not it is wise for them to eat whatever it is that they want to eat.
One issue also tied to portion size is the fast-food industry and their want for more money. One reason why portion sizes have grown in size so much over the past decades is because of price competition.