Happiness is how now you see it

 

Happiness is the 5 magical superfoods an immunologist says boost the immune system the most

Here:

Mushrooms

Ginger

Broccoli sprouts

Garlic

Turmeric

Happiness is about four ounces of mushrooms a day

From the story here:

"[T]he difference between the countries with low rates of neurodegenerative diseases is about 3 milligrams per day [of ergothioneine], which is about five button mushrooms each day."