The jawans, who complained of vomiting and diarrhoea, have been rushed to various hospitals around Thiruvananthapuram.
109 were admitted to Trivandrum Medical College Hospital.
Kerala's State Health Minister K K Shylaja had visited the ailing jawans in the hospital.
Food poisoning makes 400 CRPF jawans sick
Preliminary investigations revealed that the jawans most likely fell ill due to food they had consumed on Saturday night. In particular, officials said the fish curry they ate could be the cause.
Authorities took samples of the food for testing, to identify the cause of the ailments.
The state government has ordered an enquiry into the matter.
Four Jawans serious
Hospital authorities said, "The condition of four was a bit serious when they arrived here, but they have quickly responded to the treatment."