Just last night I read an article in a Chinese newspaper about the connection between reduced stomach acid and sinus/upper respiratory tract infections.
This interested me as I am taking protein pump inhibitors [medication] as treatment for a hiatus hernia and was alarmed to read that I am also at higher risk of developing osteoporosis too.
Perhaps your gastric band is upsetting your stomach acid levels ? I always ensure garlic and ginger capsules are taken daily so perhaps that is why I don't get colds so much.
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"Been there, done that, got the t-shirt"
- CosmicRuss