I agree that society has been designed to make things more and more convenient in the name of progress and that we haven't made the nutritious food convenient y

I agree that society has been designed to make things more and more convenient in the name of progress and that we haven't made the nutritious food convenient yet. Stated another way, poor nutrition is the default choice in most of the western world. Still, I think its possible to make the idea of "purpose" more concrete. You could define "true meaning and purpose" to be goals that are greater than oneself that require one's full potential in mind and body and sacrifice of immediate pleasures for long-term gain. The widespread nature of obesity indicates that many people don't consider a healthy body as necessary for their goals and hence don't sacrifice immediate food gratification for those goals. Hence most people don't have goals that require their full body potential.