Benjamin Lozovsky/BFAnyc/Sipa
Ana Calderone
April 27, 2015 04:45 PM

Elle Macpherson has a surprising secret to looking this good at 51 – and it involves her urine, of all things.

The entrepreneur and supermodel told the London Evening Standard that she keeps a pH balance urine tester kit in her handbag at all times to ensure her body is in an alkaline state.

“I believe that most ailments come from having an acidic body,” she says.

The co-founder and co-owner of the premium luxury wellness business WelleCo told PEOPLE she keeps her body at the preferred pH level – said to reduce stress and protect bone health – by taking her brand’s Super Elixir Alkalising Greens supplement daily.

“I don’t worry about wrinkles,” she says. “I tackle internal ageing by nourishing my cells from the inside and the welcome by-product is looking and feeling good.”

Macpherson also credits her fit physique to exercise, drinking lots of water and a consistent healthy diet free of red meat, wheat and dairy.

“I move my body for at least 45 minutes every day,” she says of her routine, which includes a mix of hiking, water skiing, swimming and running on the beach. “And drink lots of water – 3 liters a day.”

But the entrepreneur and mom of two says her best advice for looking younger is about maintaining a good mental state.

“I prefer to ‘think well,’ embrace life and enjoy the ebbs and flows,” she says. “Find beauty in everyday things, write a list of accomplishments and laugh a lot! Humor defuses everything.”

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