Healthy, don't smoke or drink. So, why am I so gassy during the day?

Other causes. Other things that can cause gas: gallbladder disease, lactose intolerance, gassy foods like beans/broccoli/cauliflower/cabbage; spicy foods; acid reflux. Limit fried/fatty/greasy foods to help gb; try lactase tablets before dairy foods; simethicone/beano for gas-forming foods. If have pain in upper right abdomen (& possible right shoulder) after eating fried/fatty/greasy food, see doc re gallbladd.