A Delhi court has reserved its verdict on a petition by Chief Minister Arvind Kejriwal - a Type 2 diabetes patient - to be provided with insulin while in Tihar Jail.

The Aam Aadmi Party has alleged that the Delhi CM "is not being given insulin despite repeated requests."

AAP leader Atishi claimed a "conspiracy to kill" Mr Kejriwal.

Atishi's charge came hours after the Enforcement Directorate - which arrested Mr Kejriwal on March 21 - opposed a request for a video consult with his regular doctor.

The probe agency's lawyer told the Rouse Avenue Court that the AAP leader's condition, if serious, had been triggered by regularly eating mangoes and sweets, and drinking tea with sugar, none of which is advised for diabetics.

"(Mr Kejriwal's) diet chart has mangoes and sweets on it... it has been placed before the court. (Mr Kejriwal) is regularly consuming foods not permitted for any diabetic patient," the agency's lawyer said.

The ED, therefore, opposed Kejriwal's request for a video consult with his regular doctor.

A furious Atishi hit back hours later, accusing the Bharatiya Janata Party of "not (being) able to defeat Arvind Kejriwal in three elections (referring to the Delhi Assembly polls)".

"... (so) a plan is being hatched to kill him by keeping him in jail," Atishi declared.

"Everyone knows Arvind Kejriwal is a patient of severe diabetes... he has been suffering for the past 30 years. To keep his sugar level under control he takes 54 units of insulin daily," she continued.

"Ask any doctor... only someone who has severe diabetes takes this much insulin. That is why the court allowed Arvind Kejriwal to eat home-cooked food... prescribed by the doctor."

Atishi also countered the ED's claim Mr Kejriwal has been eating sweets inside the jail, saying, "This is a complete lie... Kejriwalji is allowed to tea and sweets with a sweetener (as) prescribed by the doctor. This is a low-calorie sweetener given to diabetics."