There are no hard-and-fast guidelines on how many chia seeds you should eat daily. But some doctors and institutions offer reasonable recommendations, such as Columbia University, which suggests eating 20 g (or a bit under 2 tbsp.) of chia twice per day.  Naturally, this varies depending on factors such as your age, sex, and weight. Because they’re so dense in fiber, just remember to increase the amount you eat gradually and drink plenty of water.