[Boddie]

Motor neurone - Cause unknown
Obesity - Poor diet, lack of exercise
Asthma - The exact cause of asthma isn't fully understood at present
Alzheimer’s - The underlying cause of Alzheimer's – what actually triggers the changes in the brain – is still not known
Eyesight Deterioration - Most common aviodable cause is diabetes - poor diet
Depression and Chronic Fatigue Syndrome - Lack of exercise is a significant contributor to depression CFS Unknown although some people appear to develop CFS after a viral or bacterial infection, though it is not the same as the normal fatigue that often follows immediately after a bad infection like flu. Glandular fever is a common trigger

Your study seems fatally flawed to me