The marinade probably contained MSG, wheat, soybean oil, and goodness knows what else. Because you've been paleo for quite some time, when you eat any of these ingredients you're going to get a worse reaction than you did before. Take it from someone who suffers bad heartburn when I eat gluten or MSG. The thing about fatty meat causing heartburn is absolute shitty nonsense, like the rest of CW.
Type 1 diabetic for 25 years.
Low carb for 7 years, LC Primal for 2.5 of those.
Fruit and starch free.
Total weight loss- 3 stone/42 pounds. Current weight = 121 pounds. Height 5'5
I take Zymessence systemic enzymes.