Steak & egg breakfast bowl
795 → 524 kcal−34%
protein 59 → 66 g
Protein-first recipes
Keep the dish. Raise the protein.
Paste a recipe you already love. Fitnizer rebuilds it protein-first, computes every macro from a vetted food database, and sends the ingredients to Instacart. The same food you love, with more protein and fewer calories. For a healthier week, a training block, or dinner for the whole family.
Calories994477kcal
Protein2240g
Fat707g
Yakisoba with pork belly · pork belly → roasted pork tenderloin · real rebuild by the Fitnizer engine, per serving.
PhD endocrine physiologist
Real macros from a vetted database
More protein in less food
Eating less is the easy part.
Appetite drops for all sorts of reasons: a busy day, a hard training block, a lighter week. What does not change is that the protein has to come first as the plate gets smaller. Fitnizer is built to protect that, so a smaller plate still does its job.
How it works
Three steps. The same dish, rebuilt.
Paste
Drop in any recipe: a link to a recipe page, or the recipe text itself.
Fitnize it
One tap. The AI proposes the swaps and the gram weights; a calculator does the arithmetic. Same dish, protein first.
Know your numbers
Protein, calories and fat per serving, computed from a vetted database. Estimates are marked, never hidden.
Signature rebuild
The same meals, rebuilt.
Yakisoba with pork belly
Calories
994kcal
Protein
22g
Fat
70g
pork belly → roasted pork tenderloin
Real rebuild by the Fitnizer engine.
Replay
Built for eating better every day.
Protein first
Protein never drops: the app checks every rebuild and fixes it before you see it. That is the one rule the engine will not break.
Fewer calories
Lighter versions of the food you already love, with the protein kept.
No forbidden foods
Your own recipes, rebuilt — not a diet of someone else's meals. Nothing banned, nothing extreme.
Transformation gallery
Real dishes. Real numbers.
Beef stroganoff
643 → 397 kcal−38%
protein 40 → 42 g
Shabu-shabu
633 → 448 kcal−29%
protein 54 → 58 g
Chicken pot pie
466 → 283 kcal−39%
same comfort, fat 25 → 11 g
Carrot cake (bolo de cenoura)
439 → 118 kcal a slice−73%
dessert, allowed
Moqueca (Brazilian fish stew)
760 → 671 kcal−12%
68 g protein, untouched
All numbers are real rebuilds from the Fitnizer engine, per serving.
Real macros
Numbers you can trust, per serving.
Calories, protein, carbs, fat and fiber computed from a vetted nutrition database, per serving, before and after.
Muscle protection
One rule: protein never drops.
Protein never drops: the app checks every rebuild. Feijoada stays feijoada and a signature cut keeps its cut: the rules refuse to turn your food into diet food.
A fresh recipe every day
One new rebuild every day, free.
On Free, one fresh rebuild every 24 hours, saved to your account. Rate the last one and the next unlocks. Pro removes the gate entirely.
Grocery delivery
Tick what you have. Instacart brings the rest.
Every Fitnized recipe becomes a shopping list. Set your servings, tick the pantry items you already own, and send the rest to Instacart. You choose the store and see every price before you buy. United States and Canada.
- Buy only what the rebuilt recipe needs, at the store you pick.
- Instacart's pantry step catches what you already have at home.
- Prefer to shop yourself? Copy or print the list.
Fitnizer may earn a commission on Instacart orders placed through the app. Availability varies by location.
9:41
See it work
Under a minute each, narrated. Watch before you sign in.
The science
The physiology behind every rebuild.
Fitnizer isn't a random search or a chatbot guessing at a "healthy version." Every rebuild follows the same evidence a clinician would use — protein-first swaps drawn from published research, fat and texture choices grounded in how the body actually digests food, and macros calculated from a vetted database.
Why protein comes first
Protein is the part of a meal most people fall short on, and it is what keeps a plate satisfying. Fitnizer rebuilds every recipe protein-first, and never lets protein drop below the original.
Less fat, less nausea
Heavy, high-fat meals sit in the stomach longer, which is uncomfortable when your appetite is already small. Fitnizer trims the fat that isn't earning its place — swapping cooking oils, creams and fatty cuts for lean equivalents — so a meal sits easier when your appetite is low.
Real food, not protein water
You can't live on shakes and protein water — and you shouldn't have to. The point is to keep eating the meals you actually enjoy, rebuilt to fit your goal. Real, satisfying food with enough calories to function is what makes fat loss something you sustain for months, not days.
Taste is engineered, not sacrificed
A leaner recipe only helps if you'll actually make it again. So each rebuild respects the chemistry of the dish — choosing sweeteners that still brown and caramelize, protecting texture through the right cooking temperatures, and staying as close to the original as the numbers allow. The goal is the same dish, not a diet version of it.
Real macros, not AI guesswork
Ask a chatbot for a "healthy version" and it will confidently invent numbers. A web search just hands you someone else's recipe. Fitnizer is different: the AI only proposes the ingredients and amounts — every calorie, gram of protein, carb and fat is then calculated from a vetted database of 755 foods, using rules designed by a physiologist. The numbers are computed, not guessed.
Built by a physiologist
Fitnizer comes from JD Botezelli PhD — an endocrine physiologist whose work centers on insulin resistance and how the body uses food. That background is exactly what shaped Fitnizer's rules: protect muscle, ease digestion, keep the food real. It's the difference between an app that follows nutrition trends and one built on how metabolism actually works.
Grounded in published nutrition guidelines and food-science research. Fitnizer provides nutrition information, not medical advice. If you are under the care of a doctor or a dietitian, their plan comes first.
Built on physiology, not trends.
Fitnizer comes from JD Botezelli PhD — an endocrine physiologist who studies how the body actually uses food.
15+
years of research
2,000+
clients coached
40+
peer-reviewed articles
Pricing
Free every day. Pro when you want more.
Trackers charge twenty dollars a month to log what you already ate. Fitnizer changes the recipe, and the free plan stays free.
Free
$0
- One fresh recipe every 24 hours, saved to your account
- Rate the last one to unlock the next
- Real macros, appetite check-in, progress log
- Shopping list, print, and the Instacart handoff
Pro
Founding price
$6.99
a month, or $59 a year (about 30% off)
- Unlimited recipes, no gate, no waiting
- Save recipes into collections
- Improve a result again with one tap
- Founding price locked for early members
Coaches and creators: branded recipes, send-to-client and bulk rebuilds are coming at $29 a month. Tell us you want it.
Questions, answered.
Is this medical advice?
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Who is this for?
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Where do the macros come from?
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Can I use my own recipes?
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Does it work with Instacart?
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Is it really free?
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