In a statement issued on Saturday, Apollo Hospital said: "The Honourable Chief Minister of Tamil Nadu is under observation. Honourable Madam is on normal diet."
Jayalalithaa had fever and suffered from dehydration on Thursday. The Chief Minister "has no fever now and is taking normal diet", a hospital statement said on Thursday.
However, it is not known when she will be discharged from the hospital.
Ministers as well as supporters of the AIADMK leader were assembled in droves outside the hospital praying for her recovery.
Meanwhile, her supporters were seen offering prayers in temples for her quick recovery.