FDA microbiologists have found that the acid in yogurt accelerates the growth of bacteria in fish, especially if it is not very fresh.
"It's Russian roulette with salmonella," Dr. Richard Plate said in the documentary Foodborne .
Alina from Athens described the nightmare in a blog:
"After a dinner of tuna and tzatziki, I spent the night in the toilet with a temperature of 39. Doctors found listeria in the fish."
A study in the Journal of Food Protection showed that the combination of fish and fermented milk products increases the risk of poisoning by 70%.
Chef Andrea Pepper suggests using lemon juice instead of yogurt:
"The acid in lemon kills bacteria, it doesn't feed them."
Her fish marinade recipe: olive oil + lemon juice + rosemary + garlic. Soak for 20 minutes — and grill.