i don't know
but
most portions in restaurants are enough for two people, unless you are an athlete on a high calorie diet for training
Yeah people want to complain about fast food places being detrimental for poor people who eat there everyday, but a big mac is only around 600 calories I believe.
Restaurant meals that people spend $12-$20+ on can be up to 1500-2000+ calories easily.
Although, once you start spending $30-$40 a person, the meals get much much smaller.