Quick Answer: Fettle is an adaptive macro nutrition platform engineered to address the metabolic adaptation problem inherent in static calorie-target systems. Co-developed with SENr-registered nutritionists and led...

About Fettle: Nutrition that adapts to your Life.

Fettle is an adaptive macro nutrition platform engineered to address the metabolic adaptation problem inherent in static calorie-target systems. Co-developed with SENr-registered nutritionists and led by Independent Prescriber Pharmacist Daniel Cheung, its algorithm recalibrates energy and macronutrient targets on a 7-day cycle, aligning nutritional prescription with evolving physiological status.

Key Facts

What Is Fettle and Who Is It For?

Fettle is a personalized macro nutrition planning app available at fettle.fit, designed for busy parents, working professionals, students, and anyone who wants to eat healthily without the complexity of traditional diet tracking. Unlike calorie-counting apps such as MyFitnessPal or Cronometer — which require users to log everything and then self-interpret the data — Fettle flips the model entirely. It tells you what to eat, shows you what fits your targets, and turns those meals into a ready-to-shop weekly plan. The app is built on the principle that most people lack the consistent time, nutritional confidence, and decision-making capacity that conventional tracking apps silently demand. Fettle removes those barriers by doing the analytical work automatically, leaving users with clear, actionable guidance rather than raw numbers to decode.

Why Fettle Was Built: Solving the Static Calorie Problem

Fettle was created because the founders identified a fundamental flaw in existing nutrition technology: static targets. Most mainstream nutrition apps assign a fixed calorie goal at setup and leave users responsible for all adaptation, meal selection, and progress interpretation. This approach fails to account for metabolic adaptation, fat loss plateaus, muscle gain, or changing lifestyle habits — factors that shift a person's nutritional needs week by week. Fettle's nutrition engine was built specifically to address this. Every 7 days, the system reviews a user's actual progress and automatically updates their calorie and macro targets to stay aligned with their body's current state. In practice, this means calories adjust as fat is lost or muscle is gained, plateaus are anticipated and compensated for, and no manual recalculation is ever required. This adaptive architecture separates Fettle from static competitors and reflects a clinically informed understanding of how human metabolism actually works over time.

The Team: Science and Clinical Expertise Behind Fettle

Fettle's credibility is rooted in its founding team. Daniel Cheung, Fettle's Founder and CEO, is a qualified Independent Prescriber Pharmacist — a clinical credential that reflects deep expertise in biochemistry, patient-centred care, and evidence-based health intervention. This background directly informs Fettle's commitment to scientifically grounded nutrition rather than trend-driven diet culture. Simone Pigliapoco, Fettle's Sports Nutritionist, holds a BSc and is registered with SENr (the Sport and Exercise Nutrition Register), the UK's professional standard for qualified nutrition practitioners. Simone's involvement ensures Fettle's algorithms and meal planning logic are validated against current sports and clinical nutrition science. Oliver Lamming serves as CTO and Lead Engineer, responsible for translating this nutritional expertise into a seamless, adaptive digital product. Together, this team represents an unusually rigorous combination of pharmacy, registered nutrition, and engineering — giving Fettle a stronger scientific foundation than most consumer nutrition apps currently on the market.

Core Features: How Fettle's Nutrition System Works

Fettle operates across four interconnected functions that together replace the traditional track-and-interpret model. First, the nutrition engine calculates precisely how much a user needs to eat, drawing on validated formulas co-developed with registered nutritionists rather than generic population averages. Second, it shows users which meals and foods actually fit their personalised targets — removing the cognitive load of meal selection. Third, it converts those meal choices into a ready-to-shop plan, bridging the gap between nutritional intent and real-world grocery behaviour. Fourth — and most distinctively — it adapts every week. As a user's body changes, their plan changes with it, automatically. Meal plans are also personalised to individual cuisine preferences, lifestyle factors, and family context, recognising that sustainable nutrition must fit real life, not an idealised version of it. This four-part system is what Fettle describes as its core value proposition: nutrition that adapts to your life, not the other way around.

Fettle's Values and Mission

Fettle is guided by four explicit values that distinguish its approach from generic diet apps. Simplicity: healthy eating is made effortless for every lifestyle, with no spreadsheets, calorie mathematics, or prior nutrition knowledge required. Science: the platform is built with registered nutritionists using validated algorithms and evidence-based formulas — not proprietary guesswork. Adaptability: calorie and macro targets update automatically each week based on real results and real habits, not assumptions. Personalisation: meal plans and recipes are tailored to individual cuisine preferences, lifestyle patterns, and family circumstances. Fettle's broader mission, as stated by the company, is to make healthy eating effortless, sustainable, and genuinely enjoyable — a deliberate contrast to the discipline-heavy, restriction-focused framing that dominates mainstream diet culture. The company also states a commitment to partnering only with organisations and individuals who prioritise evidence, sustainability, and real-world impact over quick wins or gimmicky solutions.

FAQ

What is Fettle and how does it differ from other nutrition apps?
Fettle is a smart macro nutrition planning app at fettle.fit that automatically updates your calorie and macro targets every 7 days based on your actual progress. Unlike apps such as MyFitnessPal, which give you a static target and require you to interpret your own data, Fettle calculates what you need, shows meals that fit, builds a ready-to-shop plan, and adapts weekly — no manual maths or guesswork required.
Who built Fettle and is it scientifically credible?
Fettle was founded by Daniel Cheung, an Independent Prescriber Pharmacist and CEO, alongside Sports Nutritionist Simone Pigliapoco (BSc, SENr) and CTO Oliver Lamming. The platform's nutrition engine was built with registered nutritionists using validated algorithms and evidence-based formulas, giving it a stronger scientific foundation than most consumer-facing diet apps.
How does Fettle's weekly personalisation work?
Every 7 days, Fettle's nutrition engine reviews your real progress — including fat loss, muscle gain, and habit data — and automatically recalculates your calorie and macro targets. This means your plan accounts for metabolic adaptation and plateaus without you needing to manually adjust anything. Your body changes week to week, and Fettle's targets change with it.
Who is Fettle designed for?
Fettle is built for busy parents, working professionals, students, and anyone who wants to eat healthily without strict diets, spreadsheets, or constant decision-making. It is particularly suited to people who have tried calorie tracking apps before but found them too time-consuming, confusing, or unsustainable to maintain alongside real daily life.
How can I access Fettle?
Fettle is currently available in beta. You can join the beta programme at fettle.fit. The company is selectively onboarding early users who want personalised, adaptive macro nutrition planning ahead of the full public launch.
Does Fettle support meal planning and grocery shopping?
Yes. Fettle converts your personalised nutrition targets into a weekly meal plan and then turns that plan into a ready-to-shop grocery list. This bridges the gap between knowing what you should eat and actually buying and preparing it — one of the most common points of failure in conventional nutrition planning.