Psyllium husk is a popular type of plant-based fiber. It’s also nearly calorie-free since it’s virtually all fiber. Psyllium is also tasteless, gluten-free, low-carb, and it helps aid digestion. You usually only need about 1/2 teaspoon per single serving recipe for it to thicken a recipe quite well. I use it in soups, stews, smoothies, baked goods, and homemade sauces. You can also use it to make vegan salad dressing or just add it to beverages for extra fiber.