No the low FODMAP diet is not a life-time diet. You will follow a strict low FODMAP diet for 2-6 weeks and review your progress with a dietitian. The dietitian will then work with you to adapt your diet to your tolerance level by doing FODMAP food challenges. Recent research has also shown that following a strict low FODMAP diet in the long term can reduce levels of certain beneficial bacteria in the gut. As such FODMAPs are important to bowel health and intake up to tolerance level should be encouraged.
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Is this a life-time diet?