Is Flaxseed Good for Weight Loss?

Partly: flaxseed may support weight loss when its fiber helps you feel full and eat fewer calories overall.

When can flaxseed help with weight loss?

Flaxseed can be a useful addition to a balanced eating pattern, but it is not a weight-loss treatment on its own. Its effect depends on what else you eat, your activity and other factors that influence body weight. It may be most useful when it helps make a meal satisfying without adding more food than you need.

Research on flaxseed and weight loss is limited. For a broader look at food choices, see the best foods for weight loss.

How might flaxseed support weight loss?

Flaxseed contains fiber, including soluble fiber that absorbs water and forms a gel. Fiber can help make meals more filling and may slow digestion, which could make it easier to eat less later. The effect varies from person to person, and feeling fuller does not always lead to weight loss.

Ground flaxseed also contains fat and therefore calories. Adding it to everything you already eat may increase your overall calorie intake rather than help you lose weight. Think of flaxseed as part of a meal, not as a separate ingredient that cancels out the calories in other foods.

Weight management involves more than any single ingredient. Sleep, activity, medications, health conditions and the eating pattern you can maintain all matter. If flaxseed helps you enjoy a satisfying meal, it can play a supporting role within that larger picture.

What does the research say about flaxseed and weight loss?

In a randomized trial of 50 adults with overweight or obesity, both groups received lifestyle advice, while one group also consumed milled flaxseed. After 12 weeks, the flaxseed group had lost more weight on average:

This is encouraging, but it is one small trial. The results do not establish how much weight an individual will lose, whether the effect lasts or what amount works best. The study tested milled flaxseed alongside lifestyle advice, not flaxseed by itself or a flaxseed drink.

How can you use flaxseed for weight loss?

Try adding a small sprinkle of ground flaxseed to a meal you already enjoy, such as oatmeal or yogurt. Ground flaxseed is a practical choice because some whole flaxseed can pass through the digestive system undigested. Increase the amount gradually if you tolerate it, rather than adding a large amount suddenly.

Consider what the flaxseed is replacing as well as what it adds. For example, using it in place of a higher-calorie topping may make more sense for your overall eating pattern than adding it on top of a large serving of everything else. You do not need to eat flaxseed if you dislike it; other fiber-containing foods can also help make meals satisfying.

If you prefer it in a drink, read about flaxseed water, but do not assume the trial's results apply to that preparation. For general drink choices that fit a weight-management plan, see the best drinks for weight loss.

Who should be careful with flaxseed?

Start slowly and have fluids with flaxseed: a sudden increase in fiber can cause bloating, gas or stomach discomfort. Avoid swallowing dry flaxseed if you have difficulty swallowing, and ask a clinician before using it if you have a bowel obstruction or narrowing of the digestive tract.

Talk with a clinician or pharmacist before regularly using flaxseed if you take medicines, especially blood thinners such as warfarin or medicines for diabetes. Flaxseed may affect how some medicines work or are absorbed. Do not stop or change prescribed medication without medical advice.

If you are pregnant or breastfeeding, or are considering flaxseed for a child, ask a clinician about appropriate use. Seek prompt medical care for severe or persistent abdominal pain, vomiting, or an inability to pass stool or gas. Trouble breathing or swelling of the lips or throat after eating flaxseed is an emergency.