Lack of Sleep Makes You Fat and Stupid

From Ananova.com:

A lack of sleep makes you "fat, stupid and sick," according to German scientists.

Sleep researcher Professor Juergen Zulley from the Regensburg University Hospital in Bavaria said: "It makes you stupid because suffering from sleep deficiency diminishes your memory. Sick, because too little sleep can damage your heart, circulation, stomach and intestines. And fat because while we are sleeping are bodies release a hormone that reduces appetite.

I wonder if the opposite is true. In other words, if a person has always been fat and stupid, should I suggest that he/she get some sleep?