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Brain fog can also be a symptom of long Covid, where people suffer ongoing symptoms for months, or even years, after infection

The researchers hope their findings may help them further understand dementia and its causes.

Many neurodegenerative diseases, or conditions that result from the loss of function or death of brain cells, remain largely untreatable. Most available treatments target just one of the multiple processes that can lead to neurodegeneration, which may not be effective in completely addressing disease symptoms or progress, if at all.

Brains of older people with higher levels of the nutrient function better, nutritionists say