New Delhi, Sept. 10 -- The Supreme Court on Thursday questioned the Food Safety and Standards Authority of India's (FSSAI) proposed two-phase approach for introducing front-of-pack warning labels on packaged foods, seeking clarity on how products would be classified as "high" in sugar, salt, fat and other nutrients.

A bench of Justice J.B. Pardiwala and Justice K. Vinod Chandran asked FSSAI how it proposed to determine when a packaged food should carry a warning such as "high in sugar", "high in salt" or "high in fat".

"If you ask them to put a label, say high in salt, high in sugar, high in sodium, high in potassium, whatever it is, how will you determine it?" the bench asked.

The court specifically wanted to know whether FSSAI had pr...