Shortness of breathe (dyspnea) occurs when you are trying too hard to breathe and there is a feeling that you need to breathe deeper and faster due to shortage of oxygen. It is usually experienced if you are living with COPD, asthma or lung disorders. However, if you experience the same post eating then you may have a food allergy, GERD, hiatus hernia or mild to severe respiratory conditions. Consider consulting a pulmonologist if you suffer from frequent breathelessness post meals.
Obesity, lung, heart and certain conditions can cause shortness of breathe and fatigue.
Low hemoglobin is a symptom of anemia caused specially due to underlying medical conditions and a poor diet.
Humid air is dense, due to the high water content. This density can increase airway resistance in the body. Due to this one might find breathing difficult especially in humid climate.
If you have anemia, you are likely to suffer from shortness of breathe because there is less oxygen carrying capacity in the cells. Report such issues to a doctor so that you can resolve your anemia and respiratory difficulties.