^ My pleasure 
Apperently the chart is not suggesting any remedies for illness. Rather it is prejecting fruits and vegies which help strengthen the imunity within the body.
If someone is experiencing an asthama attack then red onion wont be of any help at that time. Similarly, If a patient is feeling symptoms of a stroke then tea would be the last thing any medical practitioner would suggest 
It is a known fact that vitamin C helps builing body’s immune system. and vitamin D makes bones stronger. Now it is my personal experience that few years ago I used to get sick with flu and cold often. But steady increase in consumption of fruits , green chillies and citrus fruits has help my body alot and now i experience that sort of illness less frequently.
By the grace of Allah, in this part of the world we get to eat so much variety of very tastey fruits all years round that it is hard to resist the temptation 