Starting a fibre-rich diet often leads to temporary gas and bloating, and according to Dr Karan Rajan, this is a natural and expected response of the body rather than a warning sign to stop. Fibre plays a crucial role in digestion and gut health, but increasing intake suddenly can initially disrupt how the digestive system functions.
When someone consumes very little fibre, their gut microbiome remains relatively inactive because there is not enough material for beneficial bacteria to break down. As fibre intake increases, these bacteria suddenly become more active, leading to fermentation inside the gut. This process produces gas which results in bloating and discomfort during the early stages.
Dr Karan Rajan explains this process using what is known as the fibre flatulence curve. At the beginning, low fibre intake means minimal gas production. As fibre consumption rises, gas and bloating increase because the gut bacteria are not yet efficient at processing the new intake.
Over time, however, the body begins to adapt. The gut bacteria evolve to handle higher amounts of fibre more efficiently, producing more helpful compounds such as short chain fatty acids instead of excessive gas. As this adaptation continues, the level of bloating gradually decreases even while maintaining a high fibre diet.
This adjustment period may feel uncomfortable, but it signals that the digestive system is improving and becoming healthier. Gradually increasing fibre intake and staying consistent helps the body move past this phase and reach a point where digestion becomes smoother and more efficient.
Health experts emphasize that this temporary discomfort should not discourage individuals from consuming fibre, as it remains essential for long term digestive health and overall wellbeing.
