Probably not. And that's probably because fish and shellfish aren't unhealthy. Do I think beef and lamb are superior? Yep, but both fish and shellfish are extremely nutritious, and contain all kinds of antioxidants that I would imagine would retard the polymerization of the oils. Not sure what it would do to your tissues overtime though if the only meat you eat are fatty fish, but that's extremely unrealistic.
Originally Posted by peril
The Inuit are known for poor aging and looking haggard, but there are 100 different explanations why from harsh conditions, lack of carbohydrate, malnutrition during cold weather, who knows. I think it's safe to say you can enjoy fresh, wild caught fish in moderate quantities.
It is worth mentioning that many studies that show fish-eating societies to be healthy tend to consume warm-water fish that are much leaner, and actually eat reasonably low protein diets. Japanese diets aren't exactly high in fat and protein.
Don't put your trust in anyone on this forum, including me. You are the key to your own success.