Donuts and other crappy food. Typical office food treats like donuts, pizza, and beer will all have negative chemical effects on team members. They will be more sluggish, less creative, and less communicative in general.
Also *x increased chance of various debilitating diseases.
Not to sound like a crazy health nut - there are two stupendous studies on the citizens of Okinawa (The Okinawa project) and China (The China study) that leave little doubt on the long term effects of junk foods.
So yes, it can.