If 1000 people eat 3000 meals per day and we increase the cost of their food by 50% what effect will that have on the number of meals eaten? Will it go down 50%

If 1000 people eat 3000 meals per day and we increase the cost of their food by 50% what effect will that have on the number of meals eaten? Will it go down 50%? People need to eat. If McDonald’s is the cheapest food or only food available (say because they are the only one available) it won’t matter that they raised their price.