If it is true that...

Creating a "deficiency" of DHA prevents retinal damage from light

and

When animals are made "deficient" in all the exogenous polyunsaturated fatty acids, they become remarkably resistant to all sorts of stress and toxins

Then it must be true that...

The polyunsaturated fats make the lungs more sensitive to excess oxygen or hyperventilation, they make the eyes more sensitive to light, and they make the brain more sensitive to fatigue

If it is true that...

Stress, a "respiratory defect", and free radical damage are common factors in disease and aging

and

The polyunsaturated fats make the lungs more sensitive to excess oxygen or hyperventilation, they make the eyes more sensitive to light, and they make the brain more sensitive to fatigue

Then it must be true that...

Old organisms are easily injured by inappropriate excitation