Restaurant owner can levy fin on the customer who wastes the food and the wasted food can be packed for them.
step by step ordering can be done or the person can leave the portion of food which is not needed for him untouched in the serving plate.
Encourage restaurant owner to sell half portion of food if their serving size is big.
we can organize a group and talk to the students about the importance of food and if we waste food how we and the future citizens suffer
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what can you say to help your friend to change their attitudes