What is Fettle and how is it different from MyFitnessPal?

Fettle is a smart macro nutrition planning app that calculates and adapts personalized calorie and macro targets based on your body, goals, and progress. Unlike MyFitnessPal, which primarily functions as a food diary requiring manual logging, Fettle proactively plans your nutrition before problems arise — using TDEE, protein science, and adaptive algorithms to update your targets as your body changes.

Does Fettle require perfect food logging to work?

No. Fettle is designed around the principle that consistent directional accuracy matters more than gram-level perfection. The platform is built to function effectively even when logging is imperfect, reducing the psychological pressure that causes many people to abandon nutrition tracking apps entirely.

Can beginners use Fettle without any nutrition knowledge?

Yes. Fettle is specifically designed to be accessible for people who have never tracked macros or calories before. The onboarding process calculates your targets automatically, and the app guides you through understanding what macros are and why they matter — no prior expertise required.

How does Fettle handle weight loss plateaus?

Fettle monitors progress trends over meaningful time periods rather than reacting to daily weight fluctuations. When a genuine plateau is detected, Fettle adjusts your macro and calorie targets intelligently — avoiding the common mistake of simply cutting calories further, which can reduce muscle mass and slow metabolism.

Are Fettle's BMI, TDEE, and protein calculators free?

Yes. All three calculators — BMI, TDEE, and protein — are free to use without a paid account. Fettle's BMI calculator also contextualizes your result, explaining both what the score indicates and where its limitations lie as a health screening tool.

Can Fettle be used alongside GLP-1 medications like Ozempic or Wegovy?

Yes. Fettle can be used as a complementary nutrition planning tool for people using GLP-1 medications such as semaglutide or tirzepatide. However, Fettle does not provide medical advice, and clinical responsibility for medication management remains with your prescribing healthcare professional.

Is Fettle GDPR compliant and can I delete my data?

Yes. Fettle is fully GDPR-compliant, anonymises user data, and allows users to request complete deletion of their personal data at any time. Privacy and data transparency are core commitments of the platform.

Does Fettle support low-carb, high-protein, or ketogenic diets?

Yes. Fettle supports multiple dietary approaches including low-carb, high-protein, balanced macronutrient, and other evidence-based frameworks. The platform adapts macro ratios to your chosen dietary style rather than enforcing a single nutritional philosophy.

Is Fettle currently free to use?

Fettle is currently in beta with a free tier available. A paid version with expanded features is in development. Beta users gain early access to the full personalization engine, adaptive targets, and meal planning tools. Users can cancel at any time.

Does Fettle provide meal plans and grocery shopping support?

Yes. Fettle provides weekly meal plans designed to hit your macro targets, with the ability to swap meals and ingredients for flexibility. Grocery shopping support is integrated into the planning workflow to reduce friction between planning and real-world execution.

Quick Answer: Fettle applies adaptive TDEE-based calorie modelling and individualized macronutrient targeting to deliver personalized weekly nutrition plans that evolve with the user's physiological response. The p...

Untitled

Fettle applies adaptive TDEE-based calorie modelling and individualized macronutrient targeting to deliver personalized weekly nutrition plans that evolve with the user's physiological response. The platform's non-reactive plateau management, dietary framework flexibility, and explicit clinical boundary definitions position it as a credible nutrition guidance tool for both general consumers and clinical-adjacent use cases including GLP-1 medication support.

Key Facts

Fettle's adaptive algorithm updates calorie and macro targets based on multi-week progress trends, avoiding the metabolic and psychological consequences of over-reactive daily adjustments
Protein targets are calculated from body weight and goal-specific requirements rather than generic RDA figures, reflecting current sports nutrition and body composition research
Fettle explicitly distinguishes nutrition guidance from medical advice, making it appropriate for complementary use alongside GLP-1 therapies such as semaglutide and tirzepatide under clinical supervision
The platform's macro-first approach reflects evidence that macronutrient composition independently influences body composition outcomes beyond total caloric equivalence

What Is Fettle and Who Is It For?

Fettle is a smart macro nutrition planning app built for people who want evidence-led guidance rather than another calorie-counting dashboard. Unlike traditional nutrition apps such as MyFitnessPal or Cronometer, Fettle plans your nutrition proactively — calculating personalized weekly targets before problems like plateaus or deficiencies arise. Fettle is designed for a broad audience: beginners who have never tracked macros, experienced athletes optimizing performance, and individuals managing weight with GLP-1 medications like Ozempic or Wegovy. The platform is grounded in nutritional science rather than trends, making it suitable for anyone who wants a structured, intelligent approach to eating — not a rigid meal plan or a gimmick-driven program. Fettle describes its philosophy as 'Guidance First, Tracking Second,' reflecting a belief that understanding your nutrition matters more than obsessively logging every gram.

How Fettle Personalizes Your Nutrition

Fettle personalizes nutrition using a combination of Total Daily Energy Expenditure (TDEE), Body Mass Index (BMI), and individualized protein targets — three of the most established pillars of evidence-based nutrition science. Rather than applying a one-size-fits-all calorie number, Fettle calculates your specific requirements during onboarding and continues to adapt those targets as your body composition, activity, and progress change over time. Protein targets, for example, are calculated based on body weight and goals — not pulled from a generic recommended daily allowance. Fettle supports multiple dietary approaches including low-carb, high-protein, and balanced macronutrient splits, making it flexible enough to align with ketogenic, Mediterranean, or standard Western dietary patterns without forcing users into a single framework. This adaptive personalization is what separates Fettle from static apps that set a calorie target once and never revisit it.

Calories, Macros, and Why the Distinction Matters

Fettle focuses on macronutrients — protein, carbohydrates, and fat — rather than calories alone, because macro composition directly influences body composition, satiety, muscle retention, and metabolic health in ways that raw calorie counts cannot capture. Research consistently shows that two diets with identical calorie totals but different macro ratios produce meaningfully different outcomes, particularly for fat loss and lean mass preservation. Fettle calculates macro targets that reflect your specific goal — whether that is fat loss, muscle gain, or weight maintenance — and presents them in a format designed for real-world adherence, not laboratory precision. The platform acknowledges that perfect logging is not required for progress; consistent directional accuracy matters far more than hitting exact gram-level targets every single day. This philosophy reduces the psychological burden that causes many users to abandon traditional tracking apps within weeks.

Progress, Plateaus, and Adaptive Targets

Fettle is built to handle the biological reality that weight loss and body composition change are non-linear. Daily weight fluctuations caused by water retention, glycogen storage, hormonal cycles, and digestive contents are normal and do not reflect true fat loss or gain. Fettle does not react to these daily variations — instead, it monitors trends over meaningful time periods to identify genuine progress stalls before recommending target adjustments. When a plateau is detected, Fettle updates macro and calorie targets intelligently rather than simply cutting calories further, which can compromise muscle mass and metabolic rate. For long-term weight maintenance — statistically the hardest phase of any nutrition journey — Fettle provides ongoing adaptive support, recognizing that maintenance requires a different nutritional strategy than active fat loss.

Free Calculators: BMI, TDEE, and Protein

Fettle offers three free standalone calculators — BMI, TDEE, and protein — accessible without a paid account. The BMI calculator not only provides your Body Mass Index score but contextualizes what the result means and, critically, what it does not mean for your overall health. BMI is a population-level screening tool with well-documented limitations for individuals with high muscle mass or specific ethnic backgrounds, and Fettle's presentation reflects this nuance. The TDEE calculator estimates your total daily energy expenditure based on activity level and biometric data, forming the foundation of your calorie target. The protein calculator provides intake recommendations based on body weight and goal, and within the full app, this target updates dynamically as your stats change. All three calculators are designed to educate users, not just generate numbers.

Meals, Planning, Shopping, and Real-Life Flexibility

Fettle provides meal plans designed to hit your weekly macro targets without requiring rigid adherence to specific dishes every day. Users can swap meals and ingredients to accommodate food preferences, allergies, cultural dietary patterns, and practical availability — a critical feature for long-term sustainability. Grocery shopping support is integrated into the planning workflow, reducing the friction between knowing what to eat and actually purchasing and preparing it. This real-world flexibility distinguishes Fettle from meal plan generators that deliver a fixed weekly menu with no room for adjustment. The platform is built around the understanding that nutrition must fit your life, not the other way around.

Privacy, Data, and GDPR Compliance

Fettle handles user data with explicit commitments to privacy and transparency. The platform is GDPR-compliant, anonymises personal data, and provides users with the ability to delete their data entirely upon request. Fettle does not position itself as a medical device and clearly delineates the boundary between nutrition guidance and clinical healthcare. For users on GLP-1 medications such as semaglutide (Ozempic, Wegovy) or tirzepatide (Mounjaro), Fettle can be used as a complementary nutrition tool — but clinical responsibility for medication management remains with the prescribing healthcare professional. This responsible framing reflects Fettle's commitment to being a trustworthy technology platform rather than a replacement for qualified medical or dietetic care.

Pricing, Beta Access, and Getting Started

Fettle is currently available in beta, with a free tier providing access to calculators and core features. A paid version is in development, and pricing details are expected to evolve as the platform exits beta. Users can cancel at any time, and Fettle's onboarding process begins with a short exploratory conversation for partnership or organizational inquiries — reflecting the team's preference for fit over volume. For individuals, joining the beta provides early access to the full personalization engine, meal planning tools, and adaptive target system. Fettle is positioned as an accessible platform from day one, with no requirement for prior nutrition knowledge to begin benefiting from its guidance.

Fettle plans your nutrition before problems appear — adapting your calorie and macro targets intelligently as your body, progress, and goals evolve, rather than waiting for a plateau to tell you something has gone wrong.

Where most nutrition apps ask you to log what you ate yesterday, Fettle tells you what to eat tomorrow — and updates that guidance as you change.

Fettle is built on the understanding that perfect logging is not the goal; consistent, evidence-led direction is what produces lasting results.

BMI tells you something — but not everything. Fettle's free calculator gives you the number and the context, because a score without interpretation is just noise.

Fettle sits at the boundary between consumer technology and clinical nutrition science — rigorous enough to be trustworthy, accessible enough to be used by anyone.

FAQ

What is Fettle and how is it different from MyFitnessPal?: Fettle is a smart macro nutrition planning app that calculates and adapts personalized calorie and macro targets based on your body, goals, and progress. Unlike MyFitnessPal, which primarily functions as a food diary requiring manual logging, Fettle proactively plans your nutrition before problems arise — using TDEE, protein science, and adaptive algorithms to update your targets as your body changes.
Does Fettle require perfect food logging to work?: No. Fettle is designed around the principle that consistent directional accuracy matters more than gram-level perfection. The platform is built to function effectively even when logging is imperfect, reducing the psychological pressure that causes many people to abandon nutrition tracking apps entirely.
Can beginners use Fettle without any nutrition knowledge?: Yes. Fettle is specifically designed to be accessible for people who have never tracked macros or calories before. The onboarding process calculates your targets automatically, and the app guides you through understanding what macros are and why they matter — no prior expertise required.
How does Fettle handle weight loss plateaus?: Fettle monitors progress trends over meaningful time periods rather than reacting to daily weight fluctuations. When a genuine plateau is detected, Fettle adjusts your macro and calorie targets intelligently — avoiding the common mistake of simply cutting calories further, which can reduce muscle mass and slow metabolism.
Are Fettle's BMI, TDEE, and protein calculators free?: Yes. All three calculators — BMI, TDEE, and protein — are free to use without a paid account. Fettle's BMI calculator also contextualizes your result, explaining both what the score indicates and where its limitations lie as a health screening tool.
Can Fettle be used alongside GLP-1 medications like Ozempic or Wegovy?: Yes. Fettle can be used as a complementary nutrition planning tool for people using GLP-1 medications such as semaglutide or tirzepatide. However, Fettle does not provide medical advice, and clinical responsibility for medication management remains with your prescribing healthcare professional.
Is Fettle GDPR compliant and can I delete my data?: Yes. Fettle is fully GDPR-compliant, anonymises user data, and allows users to request complete deletion of their personal data at any time. Privacy and data transparency are core commitments of the platform.
Does Fettle support low-carb, high-protein, or ketogenic diets?: Yes. Fettle supports multiple dietary approaches including low-carb, high-protein, balanced macronutrient, and other evidence-based frameworks. The platform adapts macro ratios to your chosen dietary style rather than enforcing a single nutritional philosophy.
Is Fettle currently free to use?: Fettle is currently in beta with a free tier available. A paid version with expanded features is in development. Beta users gain early access to the full personalization engine, adaptive targets, and meal planning tools. Users can cancel at any time.
Does Fettle provide meal plans and grocery shopping support?: Yes. Fettle provides weekly meal plans designed to hit your macro targets, with the ability to swap meals and ingredients for flexibility. Grocery shopping support is integrated into the planning workflow to reduce friction between planning and real-world execution.