By Sydney Panagos, Co-founder of TIPS Chip
What 50 Years of Data Say About Linoleic Acid Sitting in Our Body Fat
I never thought much about what was inside body fat until I read this paper. The premise stuck with me — the fats we cook with don’t just pass through. They build up. And the data on how much built up, and how quickly, surprised me.
What did Guyenet and Carlson find in their 2015 review?
Researchers Stephan Guyenet and Susan Carlson pulled together 37 studies measuring linoleic acid in human adipose tissue across 50 years and published the results in Advances in Nutrition in 2015. Average linoleic acid content rose from 9.1 percent of adipose tissue fatty acids in 1959 to 21.5 percent by 2008 — a 136 percent increase. The correlation with US dietary linoleic acid intake was R²=0.81, meaning what we ate explained roughly 81 percent of the change.
Adipose linoleic acid has a half-life of about 680 days in the body, so what shows up there reflects years of cooking-oil exposure, not a recent meal.
What does this mean in my kitchen?
For me, it wasn’t just reading a stat. It was realizing this wasn’t something that just passes through your body. It actually sticks around. That honestly changed everything for me. Five years ago, my kitchen looked like what you would expect — vegetable oils, canola oils, all the things I thought were normal and even healthy. I never questioned it. But once I started learning more, I remember going through my kitchen and literally throwing those bottles away. It felt extreme at the time but also really clear.
Now I almost cook exclusively with butter or beef tallow. It’s simplified everything. I’m not trying to over-complicate food anymore, just using ingredients that feel real and familiar. That shift didn’t just change how I cook at home. It’s what led me to build TIPS in the first place — bringing that same approach into a snack I already loved.
Why do we cook TIPS chips in beef tallow instead of seed oil?
Linoleic acid is the dominant fatty acid in most industrial seed oils — roughly 50 to 70 percent of soybean, corn, sunflower, and safflower oil. Beef tallow is about 3 percent linoleic acid. When I read that the stuff stays in tissue for almost two years, the cooking-fat choice stopped being abstract. Every TIPS chip is fried in 100 percent beef tallow because that is the fat we want to be eating, not the fat that lingers for years.
What should you watch for in your own kitchen?
The number worth remembering is the 680-day half-life. Whatever you cook with this week is still measurable in body fat two years from now. The shift Guyenet and Carlson documented happened over decades of small daily choices about which bottle came off the shelf. The same logic works in reverse — what you choose now compounds the same way.
Source: Guyenet SJ, Carlson SE. Increase in adipose tissue linoleic acid of US adults in the last half century. Advances in Nutrition. 2015;6(6):660-664. PMID 26567191.