He said he made the decision to eat fewer veggies when he found out that, in his case, consuming too much could increase his risk of developing another stone in the future.
Liam went on to say that the risk of getting another kidney stone increases to 50 per cent if measures are not taken to reduce the contributing risk factor.
“My particular kidney stone was a calcium oxalate kidney stone. It forms from having too much oxalate in your diet,” he added.
Oxalates are naturally occurring substances, which are found in many plants and vegetables including spinach, almonds, beetroot and potatoes.
When there is too much of the substance’s waste product in urine, painful stones can develop, which are unable to pass through the body via the urinary system.
Liam said the ordeal was a wake-up call, which made him realise so-called “healthy” diets and workouts may not be suitable for everyone and should be tailored to fit the person.
“If something works well for a period, great, keep doing it. If something changes and you’re not feeling great, you’ve got to reassess it and then figure it out,” he said.
Liam’s candid confession comes after his ex-wife Miley Cyrus seemingly handed him an olive branch of sorts, as his relationship with model Gabriella Brooks heats up.
According to Entertainment Tonight, a source reportedly claimed that Miley "just wants Liam to be happy".
"She knows how important love and marriage are for him, but she just needed her independence," the source claimed to the American publication.