What is a Low Calorie Diet?

What is a Low Calorie Diet?

A low calorie diet is a clinically proven diet plan that involves eating about 800 calories a day. They are considered for overweight and obese people who are managing diabetes.

Our Featured Diet Plans

OPTIFAST offers several plans for you to choose from, depending on your weight loss goals and your personal lifestyle.

6 weeks plan


Best-Selling
Full 6 Week Diet Plan

Our Six-Week Plan combines nutritional knowledge and exercise tips with behavioural strategies that can fit easily into your lifestyle.

Find Out More
lose large amount of weight


The Popular
Intermittent Fasting Plan

It offers the flexibility to switch between periods of fasting and eating, without restricting your caloric intake for days in a row.

Find Out More
Maintain my current weight


Most Flexible
Meal Replacement Plan

You can create your own weight loss plan by deciding how many meals a day you’d like to replace with our OPTIFAST meal replacement products.

Find Out More
Image showing a women smiling with a shake

Maintain Your Desired Weight For Good

Our Maintenance Plan is designed to help you to maintain your desired body weight, particularly after weight loss. Enjoy 28% off on 8 weeks maintenance diet plan, for just £1.84 per meal.

Shop 4 Weeks Plan Shop 8 Weeks Plan
Image showing a women smiling with a shake

1 Week Trial Pack

This pack is specially designed to help people in their weight loss journey in a structured and efficient way whilst getting to know OPTIFAST products. Along with One to Two low-calorie cooked meals, consume 2 OPTIFAST meal replacements a day for one week. Recommended total calorie intake of up to 1500Kcal/day

Shop Now
A Women doing exercise in the park

Want To Find Your Perfect Diet Plan?

To help you decide which diet plan is perfect for you,
Click below to calculate your BMI and discover our recommended plan for you.

Find Your Plan Now