This free choice, however, is an illusion, and probably nowhere more so than in the domain of food "choices". What most people eat is very heavily determined by agriculture and economy, culture and tradition, what our parents ate, and by what commercial interests want us to eat.
As an illustration of this, check out the graphic from the counting animals website. The chart represents the US advertising budgets of different food cooperations, compared to those of animal interest groups. It would be interesting to compare this also with government budgets for healthy eating.