In the “Cruise” phase, the dieter incorporates selected vegetables into their meals on alternative days.

Needless to say, this highly restrictive diet isn’t sustainable.

Registered dietician Brittany Lubeck similarly cautionedForbesagainst the ill effects of overconsuming protein as the diet recommended.

Kate Middleton and Prince William waving

Protein intake that is too high can cause kidney damage," she pointed out.

The princess even enlisted her nutritionist to help her gradually incorporate more carbs into her daily meals.

They also noted that Kate loves to unwind in the evenings with some Chardonnay white wine.

Kate Middleton walking

Further, as reported byHello!

It certainly seems like Kate and William’s three children inherited her sweet tooth too.

But I love it," (viaHello!

Kate Middleton and Prince William eating ice cream