Increasing the amount of fibre you eat a day by 50g can change your gut biome in just two weeks! And improving your gut biome can help to improve your immune system.
Read about the study here… https://medicalxpress.com/news/2021-03-high-fiber-diet-significant-human-gut.html
Adding fibre to your diet is easy. Whole fruits and vegetables are high in fibre so add a handful of berries, try a chia pudding or eat some hommus with celery 😃