This was interesting to see here! I used to take the difference between the two kinds really seriously when I was doing the extreme weight loss thing.<p>The first big I'm-clever moment was of course that tuna in water is just lower in calories, like the article says. So going by raw CICO logic, one tends to think, "ah naturally that will help me out. Why would I want the oil kind?"<p>But then you can end up neglecting other models that affect your condition, like macros. If you end up going without the oily foods, your skin might end up feeling incredibly dry and itchy, for example.<p>Another thing that I liked about the oil-based tuna is that if you wanted some bulk food to eat, you could add it to some salad veggies and the oil could be your salad dressing. This worked wayyyy better than water...! :-) Most commercial salad dressing is really some kind of oil-party anyway. A bit of salt and pepper and some other herbs and you were g2g.<p>(What a weird journey that was...during the time when I was loving the huge salads, I also had no idea I was about to find myself in the ER with 10/10 pain due to oxalates from all the spinach...)<p>"My diet consists of nuts, dried fruit, protein powder, nutrition bars, a variety of soups, stews, pasta, peanut butter, Nutella and so on. I have a huge variety as well as 64,000 extra calories in the form of two gallons of olive oil to add to my food." --Matt Kent, of the 42" yacht _Undaunted_