Why does eating out break a food record?
At home you can weigh. In a restaurant, a takeaway or at a friend's table, the ingredients and the portions are not yours to weigh, and the two things you cannot see are the two that carry most of the calories.
- The portion. Nobody weighed it and the sauce hides it: a community test on r/loseit found 20 to 54 percent average error on portion size alone.
- The fat. Ten grams of oil is about 88 kcal, and a pan-fried dish can hold several times that. It never shows on the plate.
Most other unknowns move the figure much less. Steamed, boiled or baked vegetables differ by a few kilocalories per hundred grams; a chicken breast loses about a quarter to a third of its weight in cooking. IZeat's protocol asks the assistant for one bundled question about the missing details that would materially change the estimate, for a restaurant dish its size, its sauce, its sides and its cooking fat, and then to state the assumptions it still makes. If you do not know, or want a quick figure, it proceeds with those assumptions said out loud.
| What you don't know | How much it changes the figure | What the assistant does |
|---|---|---|
| How much was on the plate | The largest single unknown: 20 to 54 percent off in the r/loseit test | Asks for one cue: a weight, spoonfuls, a fraction of the plate |
| What it was cooked or dressed in | A third or more: 10 g of oil is about 88 kcal | Asks, unless the words already say "grilled, no oil" |
| Raw or cooked weight | A quarter to a third of the weight for meat, two to three times for pasta and rice | Worth a question for pasta and rice; for meat the assistant usually assumes cooked and says so |
| Whole milk or skimmed, tuna in oil or in water | About a factor of two | Asks which one |
| Steamed, boiled or baked, without fat | A few kcal per 100 g | Rarely worth a question |
Bottom line: the portion and the fat are the two unknowns most worth a question; what the assistant still assumes, it says.
What are the three questions that carry the answer?
The protocol is fixed, and it is short on purpose: nobody wants a questionnaire at the table.
- What the dish was. "Chicken curry with rice" is enough; the assistant knows what a curry is made of.
- About how much. One cue suited to the food: a weight if you know it, otherwise spoonfuls or ladles, a fraction of the plate, or a known container, "a takeaway box", "a soup bowl".
- What it was cooked or dressed in. Fried, pan-fried, roasted in oil, dressed with vinaigrette, or none of that. "Grilled, no oil" closes the question.
The assistant asks only the questions your words leave open, in one message, not three. "Grilled chicken salad, the chicken dry, about a full plate, olive oil dressing" needs no question at all; grilled alone leaves the oil open. "The curry" needs all three.
"I literally only need a list with a total." r/Myfitnesspal, read 4 September 2026. Three questions and a total is the closest a restaurant meal can get to it.
What if the menu prints the calories?
Then the hard part is done. A calorie figure printed on a chain's menu is the chain's own declaration for a standard portion, the same kind of fact as a packaged label: a starting point you can quote, for the portion they describe, and no more than that for the one on your tray.
- Record it as printed, and say it was on the menu. The printed calorie figure is kept as read; because a menu prints no macros and an item carries one source, the item is stored as an estimate that quotes the menu.
- Sides, sauces and drinks are separate items, each with its own source: the menu's figure rarely includes the fries, the dressing or the beer.
- Macros are usually not printed. The assistant estimates them from the dish, following the protocol IZeat provides. The printed calories are kept as read; the item is recorded as an estimate that quotes the menu.
Independent restaurants print nothing, and that is where the three questions do the work. Fast food sits in between: the big chains print figures on the board, and a burger and fries recorded from the figure you read there keeps that printed figure; where the board prints only calories, the macros are the assistant's estimate, and the item says so as a whole.
Can you just send a photo of the plate?
Yes, and it helps with one of the three questions. A picture names the dish. It cannot tell how much is on the plate, and it cannot see the oil, which are the two things that carry the calories. So a photo gets the same questions as a sentence; the assistant is instructed not to answer a picture with a number on its own.
One community test of five vision models against a kitchen scale, posted on r/loseit in 2026 by a member whose name is a pseudonym, found 20 to 54 percent average error on portion size: "The models always know what the food is. They just can't tell how much is on the plate." That is why IZeat refuses the confident number from a picture and asks first: one portion cue suited to the food, and the cooking fat. If you have no cue at all, a second photo from the side with a fork, a ruler or your hand beside the plate gives the assistant a scale to reason from.
A photo of the menu board, on the other hand, is read as printed: the assistant reads the figures and keeps them; what the board does not print is estimated, and each item carries one source for the whole of it.
How can you order and log a restaurant meal with less guesswork?
IZeat is the calorie tracker inside ChatGPT, Claude or any other assistant. Tell the assistant you already use what you ate instead of searching for foods and entering them one by one. A restaurant is where that last part matters most: each item IZeat stores carries its source, and a restaurant plate is recorded as an estimate that says so, beside the meals whose figures came from a label, a table or you. The complaint of the calorie-counting communities is not the estimate; it is the estimate dressed as a measurement.
Before ordering, you photograph the menu and ask what fits with what is left today. The assistant reads the day from IZeat, compares the choices with the calories and macros you have left, and says which ones fit; IZeat records nothing yet. After eating you say what you actually had: "the chicken curry, about a plate, with rice, all of it". Following IZeat's protocol, the assistant asks the two things that carry the most, what it was cooked in, ghee or oil, and about how much of each; you answer; IZeat records the items as an estimate, quoting the assumptions, and returns the day so far.
| What you say | What the assistant does | How it is recorded |
|---|---|---|
| "Chicken curry with rice at the Indian place, they cook in ghee" | Asks for one portion cue, a plate or a bowl, then estimates the curry, the rice and the ghee | Three items, all estimated, each shown as one |
| "The pasta from the Italian place" | Asks the dish, the portion and the sauce or oil, in one message | Estimated after the answer |
| "A burger, medium fries, a cola, the board says 550, 320 and 210" | Keeps the calorie figures you read; estimates the macros the board does not print | Three items, each with one source: recorded as an estimate that quotes the board's figure, because the macros are the assistant's |
| A photo of a plate, no words | Names the dish, asks for a portion cue and the fat | Estimated after the answer, never before |
| "Dinner at Marie's, some kind of gratin, I had seconds" | Asks what was in it and about how much in total | Estimated; the setting, friends, kept on the meal |
Bottom line: a printed figure is kept as read; whatever you did not read is estimated, and each item says which it is, as a whole.
Then the reply is the receipt: what was recorded, item by item with its source, the meal total, and what is left for the day. If the assistant assumed a portion, the receipt says which, so a wrong assumption costs one sentence to fix.
- You eat out without losing the week. The dinner is recorded as an estimate and the day stays whole; a dinner left out would make the week's average read lower than it was.
- You fix it later in a sentence. "It was more like half the plate" updates the row through IZeat, the day is summed again, and the receipt shows the change.
- A week later, you still know why Tuesday's dinner is an estimate. Say the setting, restaurant, takeaway, friends, and the meal keeps it.
Frequently asked questions
Short answers to the questions people type, each one sourced above.
How do you count calories at a restaurant without weighing?
Answer three questions: what the dish was, about how much of it there was, and what it was cooked or dressed in. With those, an estimate is usable: the assistant records each item as an estimate, shown as one beside the weighed items, and the receipt says which portion it assumed. No scale, no search box, no ten entries to pick from, and a correction later is one sentence.
How accurate is a restaurant calorie estimate?
Honest, not precise. The portion and the fat carry most of the error, which is why they are the two questions asked. One community test of five vision models on r/loseit found 20 to 54 percent error on portion size; with the portion and the fat answered, the two largest unknowns are gone, and what remains is recorded as an estimate and shown as one.
Does IZeat use the calories printed on the menu?
Yes, when you say it. A printed menu figure is the chain's own declaration for a standard portion, the same kind of fact as a packaged label, so the figure is kept as printed. Sides, sauces and drinks are added as their own items, because the menu's figure rarely includes them. Where the menu prints only calories, the macros are estimated, and since an item carries one source, that item is recorded as an estimate that quotes the printed figure.
Can I log a restaurant meal from a photo?
You can send the photo, and it names the dish. It cannot show how much is on the plate or what it was cooked in, the two things that carry the calories, so the assistant is instructed to ask for a portion cue and the cooking fat before recording anything, rather than answer a picture with a number. A photo of a nutrition label is different: its declared values are read back to you and recorded with the label as source. A menu board is read as printed too, and what it does not print is estimated.
How do you track calories at fast food chains?
Say the figure printed on the menu or the board, item by item: the calorie figure is kept as you read it. Where the board prints only calories, the assistant estimates the macros, and because the source is recorded per item, not per figure, that item is recorded as an estimate that quotes the board. If you did not read a figure, the meal goes through the three questions like any restaurant plate and is recorded as an estimate. Sides and drinks are their own items either way.
How do you track calories at a friend's house?
Say what was in the dish and about how much you had, seconds included, in one sentence: "a potato gratin at a friend's, about a plate and a half". The assistant asks what it was cooked in if you left it open, estimates each item, marks it estimated, and keeps the setting, friends, on the meal, so a week later the record explains why that dinner is an estimate.
What about drinks and alcohol when eating out?
They are items like any other, recorded separately from the food. A glass of wine is assumed at 12 cl and a beer at 33 cl unless you say otherwise, and the receipt states the assumption so you can correct it. A drink is recorded at the calories its label or the reference table gives, alcohol included; IZeat does not recompute it from the alcohol content, and a cocktail nobody measured is an estimate.
How do you track a buffet or a shared table?
By plate, not by dish: say what you took and about how much of each, in one sentence, and the assistant estimates each item and records the meal as estimated. A second plate is added to the same meal, because IZeat keeps one meal of each type per day and the assistant amends the dinner rather than creating a second one. A shared table works the same way: say your share, not the table's.
What if I forget to log a restaurant meal?
Log it the next day and say which day it was: "yesterday's dinner was a chicken curry, about a plate". The record puts it on the day it was eaten, in your time zone, not on the day you said it. Estimated late is better than absent: a dinner that is not recorded makes the week's average read lower than it was, while an estimate keeps the day whole and says what it is.
Does eating out ruin the accuracy of the whole day?
It makes that meal an estimate, shown as one, and nothing more. The other meals keep their own sources, label or reference; the day summary lists the sources its meals came from; and the week's average over recorded days stays honest because nothing was invented or left out. One estimated dinner a week is a normal record, and the record says which dinner it was.