Opinion: 'Self-improvement' and health trends have their limits

I admit, I enjoy listening to self-proclaimed health gurus tout the benefits of some previously unknown vegetation native to the Amazon rainforest. I am fascinated by magazine articles and books disclosing how we can all live to be 100 if we just embraced kale, yoga and powdered crickets. There would be far fewer patients lined up outside of medical clinics and emergency wards, we are told.  
Frustrated by the seemingly slow progress made by conventional medicine in the development of new c