They said a section of unscrupulous businessmen mix the poisonous ingredients in foods for extra profit.

The rally was organised by Bishmukta Khabar Andolon (BKA), a movement for poison- free food, with the cooperation of Janauddog at Shahbagh in the city.

Representatives from Green Force, Muktijoddha Sangsad, and Grambangla Unnayan Committee also attended the rally.

BKA Convenor Abu Naser Khan said various chemicals and toxicants are being used for ripening the fruits artificially.

As a result, common people are suffering from various diseases like cancer, liver cirrhosis, high blood pressure and heart diseases, he added.

Abu Naser said excessive use of pesticides and chemical fertilisers in growing foods and vegetables also poses serious threat to public health.

"Consequently we, as a nation, are going down in terms of our intellects and physical health," he asserted.

Executive Director of Grambangla Unnayan Committee AKM Maksud protested the introduction of genetically modified (GM) food in the country.

He said Europe has not accepted the GM food as its impact on health is yet to be ascertained.

Maksud warned that if the government remains unaware, the multinational companies will slowly patent our indigenous crops, and in that case we shall have to buy seeds from them at higher price.

Bishwasahitya Kendra Coordinator Golam Kibria expressed his concern at the failure of Bangladesh Standard Testing Institute (BSTI) and other government bodies concerned to ensure the food security of the people.

"We shall launch a greater movement if the government does not take immediate action against the unscrupulous businessmen and protect the people's rights," he added.

An evil circle, comprising politicians, bureaucrats and businessmen, is running the country for their greed and selfishness, said engineer Shahidullah of Oil, Gas and Port Protection Movement.

BKA Secretary Khandaker Reaz Hossain, Shajhan Mridha Benu, Sharifuzzaman, and Abdul Mannan also spoke at the rally.

Earlier, a human chain was formed protesting the mixture of poisonous chemicals in food items.