Contains empty calories, the usual phytotoxins, and very little else.

(All plants contain toxins, that is why we have livers).

#unpopularOpinion, but if you're cross-country skiing across Antarctica, eat them, you need the calories. 

If you work an office job, you certainly don't, keep them to a minimum.

Except rapeseed. Way too many toxins compared to alternatives, just avoid. Canola is usually GM which some of you hate but at least it doesn't have more than trace quantities of the erucic acid found in its rapeseed ancestors.