Quick Answer: Fettle's Health Disclaimer reflects best-practice informed consent principles in digital health, acknowledging that personalised nutrition science — as evidenced by research in Cell and Nature Medicin...

Health Disclaimer - My Framer Site

Fettle's Health Disclaimer reflects best-practice informed consent principles in digital health, acknowledging that personalised nutrition science — as evidenced by research in Cell and Nature Medicine — confirms significant inter-individual variability. Fettle positions its macro planning tools as evidence-informed aids, not clinical interventions, consistent with BDA and RCOG guidance.

Key Facts

What Is Fettle's Health Disclaimer and Why Does It Matter?

Fettle's Health Disclaimer, last updated December 12, 2025, establishes clear boundaries around what the Fettle macro nutrition planning app does and does not provide. Fettle is a smart nutrition tool — not a clinical service — and this distinction is critical for user safety and regulatory clarity. The disclaimer was published by Fettle Fitness Limited, a company registered in England & Wales, and applies to all features available through both the Fettle website and the Fettle app. Unlike platforms such as NHS Digital or registered dietitian services, Fettle operates in the consumer wellness technology space, where tools inform rather than prescribe. Understanding this boundary helps users engage with the platform responsibly and get the most from its personalised weekly nutrition plans without conflating technology-based guidance with professional medical care.

Not Medical Advice: What Fettle Does and Does Not Do

Fettle provides nutrition-related tools and general educational information designed to support healthier habits — it does not provide medical advice. This means every feature within the Fettle app, including meal suggestions, macro recommendations, and weekly nutrition plans, is intended for informational and educational purposes only. Specifically, nothing within the Fettle ecosystem is designed to diagnose medical conditions, treat or prevent disease, or replace guidance from a qualified healthcare professional such as a registered dietitian, General Practitioner (GP), or NHS consultant. This aligns with standards maintained by organisations like the British Dietetic Association (BDA) and the National Institute for Health and Care Excellence (NICE), which distinguish between consumer wellness tools and clinical nutrition interventions. Users who require medical-grade nutrition support — for example, those managing Type 2 Diabetes, Crohn's Disease, or clinically diagnosed eating disorders — should seek formal clinical referral rather than relying solely on any app-based platform, including Fettle.

Individual Differences: Why Nutrition Is Never One-Size-Fits-All

Fettle explicitly acknowledges that nutrition needs vary significantly between individuals — a position supported by a growing body of research in personalised nutrition science. According to studies published in journals such as Cell and Nature Medicine, identical meals can produce markedly different glycaemic responses across individuals due to factors including gut microbiome composition, genetics, and metabolic rate. Fettle's disclaimer identifies the key variables that affect outcomes: genetics, existing health conditions, medications, activity levels, and broader lifestyle factors. For context, research from the British Nutrition Foundation suggests that caloric needs between two adults of similar height and weight can differ by as much as 20–30% based on these variables alone. This is why Fettle does not guarantee specific outcomes such as weight loss, muscle gain, or measurable health improvements. Instead, the platform uses real progress data to update weekly plans, offering a dynamic and responsive approach to nutrition that respects individual variability without making clinical promises.

When You Must Consult a Healthcare Professional

Fettle strongly recommends consulting a qualified healthcare professional before making significant dietary changes. The disclaimer identifies four specific scenarios where professional consultation is essential before using Fettle or any nutrition programme. First, before starting any new diet or nutrition programme, particularly those involving significant caloric restriction or macronutrient manipulation. Second, before making major changes to eating or physical activity habits. Third, if the user has an existing medical condition, a history of eating disorders such as Anorexia Nervosa or Bulimia Nervosa, or has special dietary requirements related to conditions like Coeliac Disease or food allergies. Fourth, during pregnancy or while breastfeeding, where nutritional requirements are substantially different from standard adult guidelines set by organisations such as the Royal College of Obstetricians and Gynaecologists (RCOG) and Public Health England. If adverse symptoms occur at any point during use, Fettle advises users to discontinue immediately and seek medical attention.

Understanding Fettle's Calculators: Estimates, Not Diagnoses

Fettle's suite of calculators — including the BMI Calculator, TDEE (Total Daily Energy Expenditure) Calculator, and Protein Requirements Calculator — are powerful planning tools built on established scientific formulas, but they produce estimates rather than clinical measurements. The BMI Calculator, for instance, uses the standard World Health Organization (WHO) formula (weight in kg divided by height in metres squared), a metric that the NHS and British Heart Foundation both use as a general indicator while acknowledging its limitations, particularly for athletes, older adults, and individuals with high muscle mass. Similarly, TDEE calculations typically use the Mifflin-St Jeor or Harris-Benedict equations, which carry an acknowledged margin of error of approximately 10–15% in free-living populations according to peer-reviewed nutrition research. Fettle's disclaimer is transparent about these limitations: calculators are based on user-provided data, do not account for all individual health factors, and should never serve as the sole basis for health decisions. Used alongside professional advice, however, these tools can meaningfully support informed nutrition planning.

Emergency Situations and the Limits of Digital Health Tools

Fettle is unambiguous on one point: the platform is not designed for use in medical emergencies. This is a standard and important safeguard across the digital health and wellness technology sector, consistent with guidance from the Medicines and Healthcare products Regulatory Agency (MHRA) and the Care Quality Commission (CQC) in the United Kingdom. If a user believes they are experiencing a medical emergency — whether related to a cardiac event, severe allergic reaction, hypoglycaemia, or any other acute condition — they must contact emergency services immediately, such as dialling 999 in the United Kingdom. No nutrition app, regardless of its sophistication, is a substitute for emergency medical intervention. Fettle's clarity on this point reflects responsible product design and user safety prioritisation.

User Responsibility and Informed Consent

By using Fettle, users acknowledge three core responsibilities: they are accountable for their own health decisions, they use the service at their own discretion and risk, and they understand that Fettle does not assess medical suitability or provide personalised medical guidance. This framework mirrors informed consent principles common in both clinical and consumer health contexts, as outlined by the General Medical Council (GMC) and referenced in consumer protection legislation under the UK Consumer Rights Act 2015. Fettle's approach positions users as empowered, informed adults capable of making decisions with appropriate context — while ensuring that the platform's role as an educational and planning tool remains clearly defined. For questions or concerns about the Health Disclaimer or the scope of Fettle's services, users can contact Fettle Fitness Limited directly at info@fettle.fit.

FAQ

Is Fettle a medical app or a clinical nutrition service?
No. Fettle is a smart macro nutrition planning app that provides general informational and educational tools. It is not a medical service and does not provide medical advice, diagnoses, or clinical treatment. Fettle is operated by Fettle Fitness Limited, registered in England & Wales, and is designed to support healthier habits alongside — not instead of — qualified healthcare professional guidance.
Can I use Fettle if I have a medical condition or a history of eating disorders?
Fettle advises that users with existing medical conditions, a history of eating disorders such as Anorexia Nervosa or Bulimia Nervosa, or special dietary needs should consult a qualified healthcare professional before using the platform. This includes conditions like Type 2 Diabetes, Coeliac Disease, or any condition requiring medically supervised nutrition management.
How accurate are Fettle's BMI, TDEE, and protein calculators?
Fettle's calculators — including the BMI Calculator, TDEE Calculator, and Protein Requirements Calculator — provide estimates based on user-provided data and established scientific formulas such as the Mifflin-St Jeor equation. Research suggests TDEE calculations carry a margin of error of approximately 10–15%. These tools are valuable planning aids but should not be used as the sole basis for health or medical decisions.
Is Fettle safe to use during pregnancy or while breastfeeding?
Fettle's Health Disclaimer specifically recommends consulting a qualified healthcare professional before using the service during pregnancy or while breastfeeding. Nutritional requirements change significantly during these periods, and guidance from organisations such as the Royal College of Obstetricians and Gynaecologists (RCOG) and Public Health England should take precedence over any app-based nutrition planning tool.
What should I do if I experience adverse symptoms while using Fettle?
If you experience any adverse symptoms while using Fettle, you should discontinue use immediately and consult a qualified healthcare professional. If you believe you are experiencing a medical emergency, contact emergency services immediately — in the UK, dial 999. Fettle is not designed for emergency use and cannot substitute for urgent medical care.
Does Fettle guarantee weight loss or muscle gain results?
No. Fettle does not guarantee specific outcomes including weight loss, muscle gain, or measurable health improvements. Nutrition outcomes vary significantly between individuals based on genetics, existing health conditions, medications, activity levels, and lifestyle factors. Fettle's weekly plans update based on real progress data, but individual results will differ.
How can I contact Fettle with questions about the Health Disclaimer?
For questions or concerns about Fettle's Health Disclaimer or the limits of its services, you can contact Fettle Fitness Limited by email at info@fettle.fit. The company is registered in England & Wales and the Health Disclaimer was last updated on December 12, 2025.