Eating Seafood Twice Weekly Cuts Alzheimer's Risk by 30%

Your weekly grocery list might already contain a powerful weapon against Alzheimer's disease, and it doesn't require a prescription or complicated meal planning.

Australian scientists from Curtin and Murdoch Universities reviewed 281 peer-reviewed studies and discovered that eating seafood twice a week can reduce Alzheimer's risk by 30 percent and dementia risk by 10 percent. The magic number is just 300 grams weekly, about two modest servings.

"We're not talking about a huge amount, and we're not talking about anything really expensive, either," said Curtin University epidemiologist Alexandra McManus. Fresh, frozen, and across all varieties, every type of seafood counts toward your two weekly servings.

The research builds on a growing body of evidence linking seafood consumption to brain health. A 2024 European study published in Aging Clinical and Experimental Research confirmed that people who ate the most fish had significantly lower rates of cognitive decline.

The secret lies in Omega-3 fatty acids found in seafood, which reduce inflammation, support blood vessel function, and maintain brain structure. While supplements exist, McManus emphasizes that whole seafood delivers far more benefits than pills alone.

The Ripple Effect

The brain-boosting benefits are just the beginning of seafood's positive impact on health. Older adults who eat seafood four times weekly maintain better muscle strength and function, reducing their risk of dangerous falls.

The cardiovascular system benefits too, with regular seafood eaters showing a 30 percent lower risk of heart disease. Mental health also improves, as adults who regularly consume seafood demonstrate a 26 percent reduced risk of depression.

Seafood provides lean protein along with essential vitamins A, D, and B-complex, plus minerals like iodine, zinc, selenium, and iron. These nutrients work together to support everything from bone health to immune function.

Nutrition scientist Joanna McMillan calls the recommendation achievable for virtually every Australian. "We're not talking about an expensive supplement routine or a complicated diet overhaul, just one small, realistic change that can make a genuine difference to long-term health," she said.

The shift from previous "eat more fish" guidance to "eat more seafood as part of a healthy diet" reflects a more comprehensive understanding of nutrition's role in disease prevention.

Two servings of seafood each week represents one simple choice that protects your brain, strengthens your body, and lifts your mood for years to come.