Why weighing is not mandatory
The kitchen scale is the most precise way to know how much you eat, no argument. The problem is different: almost nobody keeps it up. Weighing every ingredient, noting it down, calculating... is a lot of friction, and friction kills the habit. And it turns out the habit is exactly what matters: the most solid predictor of weight-loss success is not how exactly you measure, but how often you log (Burke et al., 2011). The logical conclusion: a "less precise" method you use every day beats the perfect scale you abandon in two weeks.
The 4 methods, compared
| Method | How it works | Advantage | Limitation |
|---|---|---|---|
| The hand | Palm/fist/hand/thumb = servings | Always with you; scales with your body | Approximate; you have to learn it |
| Plate method | 1/2 vegetables, 1/4 protein, 1/4 carbs | Balance and servings at a glance | Does not give a calorie number |
| Visual references | Compare with objects (deck, fist) | Fast for common foods | You have to memorise several |
| AI photo | You photograph the plate | Fastest; gives kcal and macros | Estimate (the portion is the hard part) |
The hand: the scale you always carry
It is many dietitians favourite method for a reason: your hand scales with your body size, so a big man and a petite woman get servings proportional to their needs without calculating anything. The palm marks your protein serving, the fist one of vegetables, the cupped hand one of carbs and the thumb tip one of fat. For a typical meal: one or two palms of protein, one or two of vegetables, one of carbs and one of fat. Simple, portable and surprisingly consistent.
And when you want a number: the photo
The hand and the plate control servings, but they do not give you "520 kcal". If you want that number without going back to the scale, the AI photo is the answer: you point the camera and get an estimate of calories and macros instantly. It is not gram-exact — the portion is always estimated — but it is good enough and, above all, so fast you keep it up day after day. That combination of number + zero friction is what makes it beat manual logging.
With Renzy you weigh nothing: you photograph the plate and get estimated calories and macros right away, with the option to adjust the portion if you want to fine-tune. Estimating without friction is what lasts.
Scan your food with a photo. Calories, macros and micronutrients in 3 seconds.
Pick one and be consistent
You do not need to master all four methods: pick the one that fits you best and use it always. Many people combine two — the hand or the plate to build the meal, and the photo when they want the number. It does not matter which you prefer; what moves the needle is consistency. Forget perfect precision and keep this: a simple method, repeated every day, takes you further than the most exact scale used now and then.
Renzy calculates all of this for you
Scan your food with a photo. Calories, macros and micronutrients in 3 seconds.
