Producers reportedly also had to work with each of the contestant's dietary requirements.
"They had vegan, gluten-free and dairy-free cheese,' they said. 'There was a drawer in the fridge for every brand and type of cheese," the source told the Daily Mail.
"There was so much food, plus the on-set catering, and the sponsored YouFoodz. It was such a waste! The girls didn't realise there would be food provided."
The source also claimed nearly all the girls gained about five kilos each during their time on the show.
"There was so much vegan and gluten-free food, it was literally costing [producers] $5,000 in Coles orders every shop," the insider said.
The girls apparently also have round the clock access to dozens of different chocolates as well as every type of milk alternative.
News of the costly budget comes after previous winner Irena Srbinovska revealed contestants aren't allowed to leave the mansion unless it's to go on a date.
"On our days off we hang around the pool, we exercised, we do our nails and hair,' Irena said on Instagram.
"We are permitted an online shop for urgent things (like if we run out of makeup)."
Alisha Aitken-Radburn, who appeared on Nick 'Honey Badger' Cummins' season in 2018, also spoke about the issues that arose from the ladies not being allowed their phones or access to the internet.
"It's such an interesting experience meeting everyone without seeing how they present themselves online," she said.
"It was actually quite disappointing (particularly on Bachelor In Paradise) when you'd discover a really big gulf between who someone really is and how they perform online."