Studies examining the role of nutrition in depression are surprisingly sparse, but if you read between the lines, the connection is
definitely there. Most professionals still do not focus on nutrition as a contributing factor to depression.
The primary emphasis is still on issues such as a neurochemical aberration, stress, and the like. But from own perspective, doctor believe that nutrition is a factor in about 25 percent of depressed individuals.
Pinch your nose shut and breathes through a straw, this is how asthma patient breath. Then try climbing a flight of stairs or

Asthma
chasing after something fast—say, a frisky toddler. You’ll soon be gasping for air the way someone with asthma does during an attack. It’s a frightening experience.
The usual setup for an attack combines an allergic (or supersensitive) immune system, an inherited trait, with exposure to environmental allergic triggers such as animal dander, mold spores, and pollen or to environmental irritant triggers such as air pollution, cold air, and cigarette smoke. Other activators can include respiratory infections, colds, laughter, crying, anger, exercise, and stress.