Mari Lopez who claimed her plant-based diet 'cured' her cancer and lesbianism has died from the disease.

Mari Lopez with her niece Liz (Youtube Screengrab/ Liz & Mari)

In a shocking case, Mari Lopez, who ran a food channel at home in Houston, Texas with her niece Liz Johnson, told thousands of viewers she had rejected traditional treatment for breast cancer in favour of a 90-day juice cleanse when she was diagnosed in 2015.

Lopez said that within four months of cutting out animal products she was in remission and insisted the new regime (and God) had 'healed' her of her 'gay lifestyle'.

However, her niece Liz has now revealed that her aunt passed away in December 2017, after the disease spread to her blood, liver and lungs, and belated attempts to try chemotherapy and radiotherapy failed.

Speaking to Babe, Liz blamed her own mother for triggering Mari's relapse by feeding her meat and microwaved food.

There is no scientific evidence to support Liz's claims.

According to Liz her aunt was living with Liz’s mum when she started telling her she needed to eat meat. Soon after she started giving her burgers and microwaved meat.

As her health worsened, Mari asked Liz to take down the videos, which had titles like 'stage 4 cancer healed by juicing' and a juice recipe called 'the cancer killer'.

Liz, however, refused, saying she believed that her aunt would have survived if she had stuck to her juice-based diet.

'I still agree with the message, completely,' she said. 'I would agree with it and I still go behind that message. You have your spiritual side and your physical side that work together to improve you as a whole. That's the message.'