New Delhi, Feb. 4: The Centre has proposed making food fortification mandatory for all staples like rice, wheat flour, edible oil and milk to fight malnutrition but some experts have urged a cautious approach, warning of hidden costs and unproven health benefits. The Telegraph had reported in January 2016 that Prime Minister Narendra Modi had pushed the idea of universal fortification – addition of key vitamin and minerals to foods to improve their nutritional value and address nutritional gaps in the population – in meetings with top officials of the ministries of agriculture, food and public distribution, commerce, health and women and child development.