I agree with all of the issues on how food today is less nutritious, actually harmful, compared to a century ago. I think in addition to sugar all the chemicals in processed as well as factory farmed food contributes to ill health and people's increased weight. However, I do not agree with John Mackey that we do not need health care if we eat healthy and live a healthy lifestyle (which should include exercise). People have always needed health care. Two of our grandmother's siblings died in the early 1900's, they were young in their 20's, thin, active, lived on a farm, but got tuberculosis and died. Remember tuberculosis, many people died from it before medical science developed a vaccine to prevent it and treatments to cure it. Remember polio, I got my vaccines for polio in school in the 50's. Many people died or were disabled from polio before that. Doctors in the 70's were concerned about the rise of heart disease, but rise means it did exist already and did need medical treatment as long as people have existed. Leonardo da Vinci first described coronary artery disease when he dissected the heart of a 100-year-old man. Most likely the man lived a fairly healthy life to have lived to 100 back in the 15th and 16th century. We had a great uncle who died of heart failure in his early 50's back in the early 1900's, he was thin, lived and worked on a farm, so physically active with fresh nutritious food, but he was born with a heart defect. Then there were always many mothers or babies who died in childbirth, which has its own potential risks to life, and medical science again has reduced these deaths. In a way antibiotics have caused the increase in heart disease and cancer. Before antibiotics most people died of some sort of infection and died at a younger age as a result. Infections are easy to get especially working on farms which most people also did. If you visit an old cemetery you will see lots of headstones for babies, young children, middle-aged people, you won't find many headstones for people over 65. The longer a person lives the more likely they are to get heart disease or cancer.
I do think that Whole Foods sells healthier foods than most stores, but John Mackey is advertising that buying food at his store will prevent you from needing health care, that is not true.