“Essentially, ketosis is a survival mechanism whereby the body is able to keep creating energy using a secondary source, derived from fat, until a person consumes carbohydrates again,” said Natasha.
She continued: “The shift, from using glucose to breaking down fat as a source of energy, usually happens over two to six days of eating fewer than 20 to 50 grams of carbohydrates, per day.
“During the diet transition, you will experience uncomfortable side effects from significantly cutting carbs.
“We like to refer to this as the “Veto flu”.
“These may last a few days but will pass once your body has entered ketosis.