A fat man is used to consuming about 3000k/ cal worth of food everyday. His food contains 50g of butter plus a plate of sweets everyday. besides items which provide him with other nutrients (proteins, vitamins, minerals, etc.) in addition to fats and carbohydrates. The calorific value of 10g of butter is 60k/ cal and that of a plate of sweets is of average 700k/ cal. What dietary strategy should he adopt to cut down his calories to about 2100k/ cal per day? Assume the man cannot resist eating the full plate of sweets once it is offered to him.