, risks extra jail time for having his phone behind bars.
His snaps, which appear to be taken from his cell, show various meals on plastic yellow plates, with one picture featuring a Playstation controller in the background.
A spokesperson for the Ministry of Justice said all meals served to prisoners meet nutritional guidelines.
A statement from the Prison Service read: "All prisoners are offered fruit and vegetables as part of three healthy meals a day, which meet nutritional guidelines set out by the Food Standards Agency and the Department of Health.
"We are investigating these pictures and any prisoner found using a mobile can face extra time behind bars."
HMP Risley is a category C men's prison, which means prisoners can't be trusted in open conditions but are considered to be unlikely to make a determined escape attempt.
A 2016 stated: "There was a reasonable choice of meals and the food we sampled was good.
"Lunch and dinner were selected from a four-week rolling menu with a reasonable variety of healthy options, including portions of fruit and vegetables every day.
"The quality of food that we sampled was reasonable but, in our survey, only a quarter of respondents said that the food was good."
Britain's smallest prisoner, Aiden Henry, has been released from jail — and is enjoying life as an Instagram star
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