It allows those who qualify to buy 5 kilograms of rice a month for 3 rupees (4.5 cents) a kilogram. Wheat will cost 2 rupees a kilogram, and for cereals the cost is 1 rupee.
Pregnant women and new mothers will also receive at least 6,000 rupees ($90) in aid. In a deviation from India's patriarchal traditions, the scheme designates the eldest woman in each home as the head of the household, hoping to prevent rations from ending up on the black market. This would also help keep subsidy costs from escalating, the government said.
The very poorest families, already receiving subsidized rates for up to 35 kilograms of grains a month, will continue to receive those benefits, the government said.
The expanded spending will increase food subsidies from 0.8 percent of gross domestic product to 1.2 percent.
Moody's credit ratings agency said last week that the food bill would hinder the government's ability to consolidate its finances. The Reserve Bank of India also warned in its annual report that the bill could exacerbate strains on the government budget and limit its room for maneuver in the future.
"Given the macroeconomic situation ... the timing is not right," Bimal Jalan, a former RBI governor, told Press Trust of India, though he acknowledged that the food program is otherwise a "desirable thing to happen."
The government has said it can afford to pay for the 61.2 million tons of grain required, and that recent measures such as a cut to diesel subsidies would help. It said it would cover most of the program's annual $20 billion cost, which includes existing subsidies, but it will be up to India's states to decide who will qualify.
With elections looming next year, the opposition has criticized the bill as a gimmick for winning votes while also saying the plan itself was not ambitious enough to improve nutrition.
India has offered free midday school meals since the 1960s in an effort to persuade poor parents to send their kids to school. That program now reaches some 120 million children. The country gives a similar promise of a hot, cooked meal to pregnant women and new mothers a promise the new bill extends to children between 6 and 14 years old.
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