Fish Oils and Weight Gain

by David Culshaw
(Brisbane, Australia)

Both my wife and I have been taking fish oils for the past 8 months. The fish oils have reduced my arthritis and knee pain. On the negative side, we both seem to have put on weight, my wife more than me.

I have a very healthy diet and a moderate alcohol intake. I have never gained so much weight and the only thing that I've introduced into our diets is fish oils. I take around three per day.

Has anybody else had this problem? What can you do to prevent the weight gain and still use the fish oils.

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May 02, 2008

Fish Oils and Weight Gain
by: Kevin

I haven't found any research on fish oils causing weight gain.

If you look at the label from a bottle of Carlson Liquid Fish Oils (half way down the page), you'll see it only provides 40 calories per teaspoon.

A 1000 mg. softgel of fish oil will provide only around 10 calories.

It's puzzling why you gained weight as fish oils don't slow down your metabolism nor cause a drastic increase in your caloric intake.

May 07, 2008

Me too!
by: Anonymous

I haven't changed anything except taking the fish oil. In fact I have INCREASED my exercise level including another day of weight training and cardio. I have gained about 4-5 lbs since starting this and have no other explanation.

Oct 20, 2010

Weight Gain Also
by: Anonymous

My 15 year old daughter has gained about 15 lbs in the past 3 months since she started taking fish oil. I am going to decrease amount and see if there is a difference.

Sep 13, 2011

something is odd about this
by: Anonymous

Although no research supports that fish oil causes weight gain, I imagine it does. I'm 5' 2" and weigh 159lbs. I'm trying to lose 16 pounds, but for the life of me I cannot lose weight while taking fish oil. It really helps with my anxiety, but I can only lose weight when I don't take it. I'm on a 1200 calorie diet and exercise 5 times a week, yet still weigh 159. I'm going to stop taking it again and see what happens...

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