Chia seeds are safe for most people to eat. However, there are a few groups of people who should avoid them. These include:
-People with allergies to sesame or mustard seeds. Chia seeds are related to these two types of seeds, so if you're allergic to either of them, it's best to avoid chia seeds as well.
-People with gastrointestinal issues such as Crohn's disease or irritable bowel syndrome. Chia seeds can absorb a lot of water and expand in the gut, which can exacerbate these conditions.
-Pregnant women and young children. While there is no definitive evidence that chia seeds are unsafe for pregnant women or young children, they should be avoided simply because not enough is known about their safety in these groups.