Who do you imagine has the worst eating habits? According to the study, those employed in food services don't have the best track record for healthy eating. Remember, we're largely talking about people who work in the distribution of unhealthy, processed foods. Furthermore, the food service industry is dominated by low-wage jobs. America's poor, due to a variety of factors, from food deserts to a lack of education on healthy food options, have poorer diets than those who are better off economically.

"There tends to be generally poorer cardiovascular health for those in lower paying jobs, and better cardiovascular health in those with higher paying jobs," Donald Lloyd-Jones, a professor of heart research at Northwestern University, told HealthDay.

Indeed, the study showed that the healthiest workers were those towards the top of the ladder, professionally and economically. Only 6 percent of managers smoke, a rate that amounts to a third of the national average. But 72 percent of them nevertheless had poor eating habits, a proportion lower than blue collar employees but still tragically high. Other professions with poor health include salesmen, support and administrative staff, transportation and material movers, and those working in business and finance.