Neither should be too low.
Every diet needs essential fatty acids and complex carbohyrates. Omit the wrong kind of food and eat the right kinds of fats and carbos.
Cut out only the bad fats and the refined carbohyrates to live healthier and happier.
Example:
-depression, MS and hormone deficencyies like PMS [persecute my spouce] (

) maybe caused by the deficiency of the right fatty acids.
-obesity is often caused by refined carbohyrates. (

)