Amaranth is generally considered low FODMAP in small servings. A portion of about a quarter cup of cooked amaranth grain is typically well tolerated by people following a low FODMAP diet, but larger servings can push fructan levels into moderate or high territory. The key with amaranth, like many grains and pseudocereals, is portion size.
Why Serving Size Matters
Amaranth does contain fructans, one of the fermentable carbohydrates that cause symptoms in people with IBS and other digestive sensitivities. Research on amaranth bran measured its fructan content at roughly 0.96% of dry weight, which is notably lower than wheat bran at 2.64%. That’s a meaningful difference, but it doesn’t make amaranth fructan-free. As you increase your portion, fructan levels accumulate and can trigger bloating, gas, or abdominal pain.
A cooked serving of about 1/4 cup (roughly 45 to 50 grams) keeps fructan levels low enough for most people in the elimination phase. If you’re in the reintroduction phase and have tested your personal tolerance to fructans, you may be able to eat more. But during elimination, sticking to that smaller portion is the safer approach.
How Amaranth Compares to Other Grains
Quinoa is the go-to low FODMAP grain alternative, and it remains low FODMAP at a full cup cooked, giving you much more flexibility. Rice, both white and brown, is also well tolerated at generous portions. Oats are low FODMAP at about half a cup cooked. Amaranth falls on the more restrictive end of this spectrum, with its safe serving size being smaller than most other low FODMAP grain options.
Nutritionally, though, amaranth holds its own. It contains roughly 13 to 18 percent protein, which is comparable to or slightly higher than quinoa’s 13 to 17 percent. Both are complete proteins, meaning they contain all essential amino acids. Fiber content is similar too, with amaranth ranging from about 3 to 7 percent and quinoa from 2 to 10 percent depending on the variety. If you’re looking for nutrient density in a small serving, amaranth delivers.
Amaranth Flour and Puffed Amaranth
Different forms of amaranth can change the equation. Amaranth flour, which is more concentrated than the cooked whole grain, means you could hit a higher fructan load faster. If you’re baking with amaranth flour, keep your per-serving amount modest and consider blending it with rice flour or another well-tolerated flour to dilute the fructan content.
Puffed amaranth, often used as a cereal topping or in snack bars, is very light by weight. A small handful may be well within low FODMAP limits, but it’s easy to eat more than you realize because the volume is deceptive. Weighing your portion rather than eyeballing it gives you a more reliable result.
Tips for Adding Amaranth to a Low FODMAP Diet
Amaranth works well as a side dish, cooked in water or low FODMAP broth until it reaches a porridge-like consistency. It also adds texture to salads when cooled, or can be stirred into soups as a thickener. In all cases, measure your portion before adding it to a recipe rather than estimating after the dish is assembled.
- During elimination: Stick to about 1/4 cup cooked amaranth per sitting. Pair it with confirmed low FODMAP ingredients to avoid stacking fructans from multiple sources in the same meal.
- During reintroduction: If you’re testing fructan tolerance, try gradually increasing your amaranth portion over three days and tracking symptoms. This helps you find your personal threshold.
- Stacking risk: Even if amaranth alone stays within safe limits, combining it with other foods that contain small amounts of fructans (like certain nuts or vegetables) can push your total fructan intake over the edge. Consider what else is on your plate.
Amaranth is a nutritious, gluten-free option that fits into a low FODMAP diet with some care around portions. It’s not as forgiving as rice or quinoa, but for variety and protein content, it’s worth keeping in your rotation at the right serving size.