As for what made the diets so poor? There were three main things that affected risk of early death most strongly: high intake of sodium (more than 3 grams a day), low intake of whole grains (less than 125 grams a day), and low intake of fruits (less than 250 grams a day). Additionally, diets low in nuts and seeds and low in vegetables were also top contributors.

…So though it is important to limit your intake of sodium and added sugar, it is just as beneficial to make sure you are subbing them wisely, by increasing your consumption of fruits, whole grains, nuts and seeds, and vegetables.

Bad Diet More Deadly Than Smoking or High Blood Pressure – Diet Health Effects

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