Maybe it is possible.
This one's in Tokyo and it was designed by the Tanita scale corporation.
According to this tiny news item,
"Each table is fitted with a weighing scale to ensure healthy portions can be measured out, while a timer tells the diner when the optimum duration of 20 minutes for completing their lunch is over. Professional dieticians are also on hand to provide free advice on eating regimes in a special counselling room."Sounds fabulous to me (other than that weird timer thing).