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I Asked AI to Count My Carbs 27,000 Times. It Couldn’t Give Me the Same Answer Twice.
(www.diabettech.com)
this post was submitted on 01 May 2026
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Technology
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To be fair there's no way of knowing what the filling is, so the AI may be guessing based on that too
Nope, Claude and Gemini both guessed fewer carbs than are in the bread.
Friendly reminder that LLMs don't do math, they guess what number should come next, just like words.
It can probably link the image to the words "a photo of a sandwich on a plate", and interpret the question as "how many calories are in a sandwich" but from there it is just guessing at the syntax of an answer, but not at finding any truth.
It knows sandwiches have calories and those tend to be 3-4 digit numbers, but also all numbers kinda look the same, so what's to say it's not 2, 5, or 12 digits?
Tool-powered agents can do math though. The issue is the fuzziness of it trying to guess carbs. It doesn’t know weight, ingredients, or anything other than a picture. These tools can be useful but not for this. Maybe one day but not yet.
Whoever claims an AI (LLM or agents) can do that and charging their users is lying and defrauding them.
The apps are advertising that they can do this tho. Many of them are aggressively sponsoring YouTubers who advertise you can basically just wave your phone over the food and it takes away all the “work” from traditional calorie counting apps
But the ai assumes itself infallible, at least it could ask...
That's true, it should ask follow-up questions, or at least clarify its assumptions