I had never heard of such a thing so it got my curiosity going. For some reason the phosphate additive stuck with me so I went offsite to peruse different things and here is what I found, verbatim: Phosphate salts can irritate the digestive tract and cause stomach upset, diarrhea, constipation, and other problems. I sincerely hope this helps. I was guessing when I thought that possibly the mercury from the fish doesn't mix well with the added phosphate, but came up empty handed on that. Hope this helps and happy tummy days.
28 Apr 2018
I have experienced the same (mysterious) heartburn symptoms when consuming albacore tuna packed in water (specifically Chicken of the Sea) for the last few months. I typically mix with Best Foods mayo and a little sweet pickle relish. I just want to emphasize that this is not minor irritation and haven't noticed with (any) other foods other than pepperoni-type foods which I no longer consume. No help but at least you aren't alone!
21 Jun 2018
Im commenting because I ate tuna fish today and now I have bad heartburn. I googled it looking for answers, cause I'm on a diet and tuna is on the list but now I have to rethink it,, because I have GERD and that's part of why I'm eating right and dieting
12 Jul 2018
I was searching for tuna/heartburn and found your posting. Like you, my partner and I love tuna! However, it gives both of us severe heartburn if we do not take an anti acid. We also only buy white albacore in water and have the same reaction from all brands we have tried. Hence, only eat it on occasion and only at lunch with a Pepcid first. I also know this didn’t help, but to let you know there are far more then just you with this inconvenience.
10 Aug 2018
Tuna is high in omega 3 which is a fatty acid. So since you have heartburn and or Gerd.adding fat or acid is a horrible thing to do I have Gerd also and it upsets me when I eat tuna or any kind of Omega Rich fatty acid fish. it also happens when I eat avocados sometimes.hope this helps
15 Jun 2020
Wow! I am glad I am not the only one who is experiencing this. I have always had stomach issues, acid reflux on and off for many years, and especially in the middle of the night, where it wakes me up and I have to sleep sitting up until it settles down. I used to take Gaviscon, but I don't like taking anything so I try to drink as much water as I can, or have a light snack like a granola bar, which will usually aid in settling it down. I guess I will just have to avoid Tuna for the foreseeable future, even though it is one of my favorites.
13 Mar 2021
I have had this problem with canned tuna pretty much my whole life. I remember when I was a teenager my dad would buy canned tuna packed with oil. That would always give me bad heartburn. I thought maybe it was the oil that was causing it, so I tried it packed with water. That made absolutely no difference, it still gave me really bad heartburn. So I just stayed away from it for years, until last year. My girlfriend made a tuna casserole last year and I ended up eating a large portion of it. I thought sure that I would regret it later but to my surprise, I didn't even get the slightest bit of heartburn. So about 3 day's ago I didn't think twice about fixing myself a tuna salad sandwich, and WOW, I got the worst heartburn that I've had in years. I love super spicy foods, so much so that I grow my own hot peppers because nothing I can find at the store is hot enough, but nothing ever gives me heartburn except for canned tuna prepared straight out of the can.
Apparently the cooking process like in a tuna casserole breaks down whatever is in it that causes heartburn because I had absolutely no problems from that, but I will definitely stay away from eating it straight from the can.
16 May 2021
I have had this problem for years. It doesn’t matter what brand I eat. I eat it alone, out if the can, and I still have the issue. I wonder if it would help to thoroughly rinse it in a colander before eating it. I may try this because I miss eating it so much!
16 May 2021
I already added a comment quite a while ago re heartburn associated with albacore (or any) canned tuna but since I just received a notification that someone commented on this thread, it appears to still be active and I wanted to share that I have great news! I've discovered that Wild Planet canned tuna does not cause this issue. Starkist, Bumblebee, Chicken of the Sea... every one of them causes severe heartburn/GERD symptoms for me. So much so that I completely eliminated all canned tuna from my diet. While at Costco one day, another shopper was adding several stacks of Wild Planet to her cart and we started talking about the subject. She insisted that Wild Planet does not cause heartburn because it is free of everything that the others are processed with. I tried it and it really is true - it's amazing and NO GERD symptoms, I swear!
It is more expensive than the garden variety canned tunas out there but if you've always loved (but had to eliminate it from your diet due to the horrid heartburn) - Wild Planet is the answer.