Very low calorie diets are regarded as extreme diets and anyone interested in trying the diet should consult their doctor or specialist who can assess its suitability for you.

• Very low calorie diets are defined as those with a calorie intake of 1,000 calories or less for 12 weeks and often rely on commercial meal-replacement products such as diet milkshakes, soups or bars.
• Very low calorie diets should only be followed under supervision, ideally from a registered dietitian, and may require medical monitoring.
• This can be achieved through carefully creating a weight loss plan with a support of your diabetes healthcare team

Is the diet safe to follow?

• Very low calorie diet plans should not be followed by children, or pregnant or breastfeeding mothers.
• If you are on insulin, or medication, such as sulphonylureas or glinides, a very low calorie diets plan could significantly increase the risk of hypos.
• You should always inform your Diabetes Healthcare team at your GP practice if you are changing your diet plan. They can help you adjust your medication.

British Dietetic Association verdict

• Rapid weight loss can be motivating, but it's unsustainable. People often regain weight after the diet and, overall, research suggests there's little difference between a Very Low Calorie Diet (VLCD) and conventional weight loss after 1 to 2 years.
• A VLCD requires regular support and counselling from a healthcare professional and is very effective with people who have struggled to lose weight for years.
• A VLCD that involves eating 1,000 calories or fewer should not be followed for more than 12 continuous weeks.
• One issue with very low calorie diets is ensuring you get enough essential vitamins. A dietitian can help you to ensure your nutritional needs are best met whilst following the diet.