For a few people the enjoyment of eating bread is followed an hour or two later by uncomfortable bloating. This bloating is harmless and is due to bowel bacteria fermenting foodstuffs, producing gas in the process, but it can produce abdominal discomfort. There are two main components in bread that can cause bloating. First, the fibre content – both roughage fibre found in wholemeal, and soluble fibres found in all breads – can be fermented to cause wind. Secondly, the freezing of bread dough before baking, or storing bread in a freezer after buying, changes some bread starch into another form called 'Resistant Starch 3', or RS3. Our bowel bacteria love RS3 and will happily ferment it. To avoid the bloat, avoid bread from frozen dough (ask your baker), don't freeze bread, and bear in mind your portion size. 60-100g of bread should be fine at a serving, but a 12” sub or large, squashed bread panini, may not.