According to his research, the best ways to avoid depression are to avoid anything that links to inflammation.
To avoid inflammation :
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Exercice 30 minutes every single day
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Eat a lot of vegetables, fruits, nuts, and mushrooms. Avoid inflammatory food such as processed meat or red meat.
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Don’t smoke
Only “up to one third can be fixed by avoiding inflammation”
So, he’s going to give almost the same advice as everyone else and not even help the other ~66%, and that’s “up to” so it could actually only fix less than that, he didn’t give a lower bound, could be less than 1%.