What The Fast 800 does

The Fast 800 (operated by Healthlab Online Ltd, a UK private limited company headquartered in Witney) is a digital-first weight loss and metabolic health programme built on Mediterranean-style eating and intermittent fasting. Its core offering is a 12-week guided online programme delivered via website and native iOS/Android apps, structured around three configurable approaches — The Very Fast 800 (800 kcal/day rapid weight loss), The New 5:2 (intermittent fasting with two 800-calorie days per week), and The Way of Life (maintenance) — plus a newer low-carb Keto variant and a GLP-1 medication support track. The platform combines a personalised onboarding quiz, 1,000+ recipes, 450+ exercise videos, 60+ meditations, automated shopping lists, and personal trackers for weight, waist, HbA1c, mood and sleep, with a private member community moderated by trained health coaches.

The business monetises across four streams: (1) a 12-week guided subscription priced at £29.99/month GBP / $49.99 AUD / $39.99 USD, (2) a lower-priced Graduate Support Membership at £12/month for ongoing access post-programme, (3) direct-to-consumer e-commerce sales of shakes, protein bars, vitamins, supplements and bundles, and (4) book sales and affiliate royalties via the Dr Michael Mosley book series on Amazon. Distribution is primarily D2C through the website and mobile apps, with a B2B2C layer via healthcare professional referrals (including NHS worker discount codes) and an Australian sub-site serving APAC. The programme claims 120,000+ members and an independently audited cohort of 23,745 members showing average weight loss of 6kg at 3 months (8.7kg sustained at 12 months for obese members) and clinically meaningful HbA1c improvements in diabetic participants.

Name

The Fast 800

Legal name

Healthlab Online Ltd

Website

https://thefast800.com

Company type

Private

Founded year

2018

Operating status

Operating

Headcount range

11–50 employees

Short description

The Fast 800 (Healthlab Online Ltd) is a UK-based digital health platform delivering a subscription weight loss and metabolic health programme built on Mediterranean diet and intermittent fasting, with companion e-commerce products, serving over 120,000 consumer members across the UK, Australia and the USA.

Ownership category

akta.pro rank

Headquarters

HQ city

Witney

HQ country

United Kingdom

HQ region

Europe

Offices1 record

Markets served

GTM type

B2C

Offering type

Services

Cost components

Marketing or Sales, Personnel, Technology or R&D, Operations, Supply Chain, Others

Revenue model

1. 12-Week Guided Programme Subscription: Subscription programme broken into three monthly payments. Includes personalised meal plans, recipes, exercise videos, community access, health coach support, and tracking tools. After 12 weeks, members transition to reduced-cost Graduate Support Membership.
2. Graduate Support Membership: Monthly subscription for continued access to recipes, workouts, community and content after completing the 12-week programme. First month free after programme completion.
3. Meal Replacement Products: Direct-to-consumer sales of shakes, protein bars, vitamins, accessories and bundles. Products include Original Shakes (£22.99), Protein Bars (£26.99), Multivitamins (£17.99), and bundle options. Available via e-commerce website.
4. Book Sales and Content Licensing: Published books by Dr Michael Mosley, Dr Clare Bailey Mosley and Dr Jack Mosley including The Fast 800, The Fast 800 Keto, The 8 Week Blood Sugar Diet, and others. Sold via Amazon affiliate programme.

Pricing tiers

Go-to-market motion2 records

Distribution channels4 records

Marketing channels8 records

Core offering

The Fast 800 operates a 12-week guided weight loss and lifestyle programme built on Mediterranean-style eating and intermittent fasting, delivered via a website and mobile apps. The offering includes three core diet approaches (Very Fast 800, New 5:2, Way of Life) plus a Keto option, supported by personalised meal plans, 1000+ recipes, 450+ workouts, mindfulness meditations, tracking tools, and a moderated community. The company also sells its own branded meal replacement shakes, protein bars, supplements, accessories, and a series of books authored by its founders.

Product overview

The Fast 800 is a comprehensive weight loss and wellness platform offering a multi-approach programme centred on Mediterranean-style diet and intermittent fasting. The core offering includes three diet approaches: The Very Fast 800 (800 calories/day rapid weight loss for up to 12 weeks), The New 5:2 (intermittent fasting with two 800-calorie days per week), and The Way of Life (long-term maintenance). The Fast 800 Keto was added as a lower-carb option (~20-30g carbs/day). The programme is delivered through an online platform and mobile app, providing 1000+ recipes, 450+ workouts, meditations, personalisation quizzes, tracking tools, and community support. The product portfolio extends to meal replacement shakes (Original and Vegan varieties in multiple flavours), protein bars, protein and fibre supplements (Keto Protein Powder, Fibre Blend), vitamins (Multivitamin, Energy, Immunity+Bio-Cultures, Vegan Omega 3), accessories, curated bundles, and a book series authored by Dr Michael Mosley, Dr Clare Bailey Mosley, and Dr Jack Mosley covering various diet and health topics.

Differentiator

Problem solved

Functional benefit

Brands

• The Very Fast 800: 800 calorie per day rapid weight loss program for up to 12 weeks
• The New 5:2
• The Way of Life
• The Fast 800 Keto
• The 5:2 Diet

Products and services

• The Fast 800 Online Programme A 12-week guided online weight loss and lifestyle programme based on Mediterranean-style diet and intermittent fasting, with personalised meal plans, 1000+ recipes, 450+ workouts, meditation content, health coach support and member community.
• The Very Fast 800 A short-term rapid weight loss diet phase using 800 calories per day for up to 12 weeks, designed to trigger metabolic switching from carbohydrate to fat burning.
• The New 5:2 An intermittent fasting diet approach with two 800-calorie fasting days per week and five days of healthy Mediterranean-style eating for gradual sustainable weight loss.
• The Way of Life A long-term maintenance diet approach based on Mediterranean-style eating with no calorie restriction, designed for weight maintenance and overall health improvement.
• The Fast 800 Keto A lower-carbohydrate meal plan option offering approximately 20-30g of carbs per day with 50-60g of protein, designed as a metabolic kick-start for members who want a keto-aligned approach.
• The Fast 800 Mobile App Interactive iOS and Android mobile application delivering the Fast 800 programme, progress tracking (waist, weight, HbA1c, mood, sleep), meal plans, exercise videos, meditations, and access to the member community.
• Medical Weight Loss Support A programme pathway designed to complement medically assisted weight loss with GLP-1 medications (Ozempic, Mounjaro, Wegovy), providing nutrition, exercise, and habit-formation support for injection users.
• Original Shakes Whey-based meal replacement shakes in multiple flavours made with 100% natural ingredients, fibre, healthy fats and 26 vitamins and minerals (~200 calories per 50g serving).
• Vegan Shakes Plant-based meal replacement shakes available in Chocolate, Vanilla and Strawberry flavours, with nutritional profiles comparable to the Original Shakes.
• Protein Bars High-protein, high-fibre snack bars (13g protein, 9.3g fibre per serving) made from natural ingredients including pea protein isolate and chicory root fibre, sold in boxes of 12.
• Keto Protein Powder Protein powder with 120 calories and 22g protein per serving, formulated as keto-friendly with less than 10% energy from carbohydrates.
• Multivitamin Supplement A daily multivitamin containing vitamins A, D, E, folic acid, potassium, zinc, calcium, magnesium, selenium and iodine, formulated to support nutritional needs during calorie restriction.
• Energy Supplement An energy-support supplement containing B vitamins and iron, designed to reduce tiredness and fatigue during fasting or periods of stress.
• Immunity + Bio-Cultures Supplement An immune-system and gut-health supplement formulated to bolster immunity and support serotonin production for improved mood.
• Vegan Omega 3 Supplement A plant-based omega-3 supplement sourced from flax and algae, designed to support cell function, heart and brain health in vegans and vegetarians.
• Accessories Shake preparation and hydration accessories including the Mixie handheld power whisk, shaker bottles, double-walled insulated bottles, and measuring scoops.
• Protein Boosters Bundle A curated value bundle of protein supplements designed to help members meet daily protein intake goals during the programme.
• Gut Reset Bundle A curated bundle pairing shakes with supplements to support a gut-health reset, with a free Mixie whisk included.
• The Fast 800 Book Series A series of books by Dr Michael Mosley, Dr Clare Bailey Mosley and Dr Jack Mosley covering the Fast 800 diet programme, recipes, keto variants and healthy living guidance, sold via Amazon.
• The 8 Week Blood Sugar Diet Book by Dr Michael Mosley focused on an 800-calorie diet approach to reverse type 2 diabetes, sold via Amazon.
• Food Noise by Dr Jack Mosley Book by Dr Jack Mosley exploring GLP-1 drugs and their effect on appetite and food cravings, weighing them as a potential game-changer versus health hazard.

Quantifiable outcome

• Average weight loss of 6kg for all members at 3 months
• +9 more outcomes

Named customers18 records

Segments5 records

Ideal customer profiles3 records

Technology focussed Yes

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature3 records

Partnerships

Six partnerships are on record, tiered core and minor.

• Oxford University (DIAMOND Study)coreStrategic or Co-development PartnerOxford University researchers, led by Dr Clare Bailey Mosley, conducted the DIAMOND Study examining the feasibility of using an 800-calorie, low-carb, Mediterranean-style diet as treatment for type 2 diabetes. Study showed 9.5kg average weight loss after 8 weeks with significant blood sugar and blood pressure improvements.
• Newcastle University (DiRECT Trial)coreStrategic or Co-development PartnerProfessor Roy Taylor and team at Newcastle University conducted the DiRECT trial exploring 800 calorie/day diet for type 2 diabetes remission. Results showed 46% of intervention group achieved diabetes remission vs 4% control.
• Oxford University (DROPLET Trial)coreStrategic or Co-development PartnerOxford University researchers conducted the DROPLET trial examining 800 calorie/day diet for obese and overweight participants. Intervention group lost average 10.7kg at 12 months, over three times more than control group.
• NHS OrganisationscoreStrategic or Co-development PartnerThe Fast 800 Online Programme was independently validated by healthcare advisors who work in partnership with NHS organisations. Programme aligns with NHS Diabetes Prevention Programme and NICE guidelines. NHS workers eligible for discount codes.
• University of Southern California Longevity InstituteminorStrategic or Co-development PartnerProfessor Valter Longo, director of USC's Longevity Institute, is cited as supporting the science of fasting for delaying ageing and preventing chronic diseases. His research informs the fasting components of the programme.
• PREDIMED Study ConsortiumminorStrategic or Co-development PartnerLarge multinational trial (7447 participants) examining Mediterranean diet supplemented with nuts or extra virgin olive oil. Results showed 30% reduction in major cardiac events and 52% reduction in type 2 diabetes risk. Foundational research for The Fast 800's dietary approach.

Scale indicators14 records

Recent moves6 records

Expansion highlights5 records

Direct peers

• Second Nature (formerly OurPath): UK digital weight-loss and behaviour-change programme with coaching, meal plans, and NHS-commissioned programmes. Closely comparable to The Fast 800 in audience (UK overweight/obese adults), NHS positioning, and digital subscription plus health-coach support model.
• Simple Life (Simple): Digital weight-loss app offering personalised programmes, calorie tracking, and coaching. Comparable in app-first subscription model and adult weight-loss audience, with broader generalised content versus The Fast 800's clinically-anchored Mediterranean framework.
• Diet Doctor: Digital platform offering low-carb and ketogenic diet programmes with paid membership, recipes, and educational content. Directly comparable to The Fast 800 in low-carb/Mediterranean dietary positioning, subscription monetisation, and evidence-based approach to metabolic health.
• Noom: Digital subscription weight-loss programme combining psychology-based coaching, meal tracking, and community support. Closely comparable to The Fast 800 in business model (DTC subscription, app-first, behaviour-change focus) and target customer (overweight/obese adults seeking sustainable weight loss).
• Oviva: UK/Europe digital health provider offering app-based dietary and lifestyle programmes delivered via NHS and insurers. Closely comparable to The Fast 800 in B2B2C NHS-aligned model, clinical evidence base, and behavioural coaching for type 2 diabetes and obesity.

Broad incumbents

• WW International (Weight Watchers): Global incumbent in the weight-loss category with a digital + community subscription model, branded food products, and clinical partnerships. Comparable to The Fast 800 in core weight-loss proposition but operates at a far larger scale with established brand equity and broader content.

Emerging players

• Lumen: Hardware-plus-app metabolic-health platform using breath-analysis to guide personalised nutrition. Comparable in metabolic-health positioning and consumer subscription model, though more focused on device-driven personalisation than the dietary-framework approach of The Fast 800.
• Zoe: UK-based personalised nutrition subscription combining gut-microbiome and blood-sugar testing with app-based coaching and recipes. Comparable in digital subscription wellness, personalised meal guidance, and metabolic-health positioning, with an emphasis on personalised data rather than a fixed-calorie framework.
• Ro (Roman / Ro Health): US digital health platform offering weight-loss services including GLP-1 medication access and behaviour-change coaching. Comparable in combining telehealth, weight-management subscription, and the GLP-1 adjacent positioning that The Fast 800 is targeting.

Regional players

• Slimming World: UK-originated weight-loss programme with group support, branded recipe books, and a subscription membership model. Highly comparable in category (UK weight-loss programme) and audience, though primarily delivered through in-person groups versus The Fast 800's digital-first approach.

Market position

Strengths5 records

Weaknesses4 records

Competitive moat5 records

Key risks5 records

Key highlights7 records

Customer concentration

• YouTubeyoutube.com/@thefast800_official
• Facebookfacebook.com/thefast800
• Instagraminstagram.com/thefast800_official
• TikToktiktok.com/@thefast800_official
• Pinterestpinterest.co.uk/thefast800

Revenue estimate

Valuation estimate

Number of profiles

Profiles2 records

Funding overview

Funding rounds1 record

Investors1 record

Funding detail is available on the Subscription and Enterprise plan.Contact sales →

M&A

Investments

M&A and investment is available on the Subscription and Enterprise plan.Contact sales →

Frequently asked questions about The Fast 800