Doy reads your week: AI nutrition insights that don’t scold

What is an AI insight in Doydum?

Every metric in Doydum has a progress chart: calories, water, steps and weight, over 7, 30 or 90 days. Under each chart there’s a card where Doy waits at a little desk. Tap Ask Doy and he reads that chart, for that period, and writes you a note.

We built it because a chart answers “what happened?” but not “so what?”. A dietitian looking over your log might notice that your weekdays are steady and your Saturdays aren’t. Doy tries to read your data with that kind of eye, in plain words and in the app’s language, English or Turkish.

Two things are deliberate. First, Doy only reads when you ask. Nothing is analysed in the background, and no note turns up uninvited. Second, the note is written by an AI, Anthropic’s Claude, speaking as Doy, and every note says so at the bottom: “AI-written · not medical advice”. There’s a preview on our homepage.

What’s in a Doy note?

Every note has the same shape:

A note stays the same while your logs do. Log more after it was written and the card says so; ask again to refresh it.

What does Doy look at?

Doy reads the same daily numbers the chart draws, loaded for him by the server, so the note and the chart can’t disagree. Around them he gets the context a professional would ask for:

• Your plan: the daily calorie target and its minimum, macro targets, water and step targets and your planned meals. Resting energy comes from the Mifflin–St Jeor equation (Mifflin et al., 1990), the same maths as our calorie calculator.
• Your profile basics: age, sex for the formula, height, goal and pace, activity level, your sign-up weight and your latest weigh-in.
• Your other metrics on the same days, so a calorie note can notice your steps and a water note your meals.
• For calories, your recent meals: what you logged over the last two weeks, with times and nutrition.

He reads the way we’d want a professional to. A day you didn’t log is “not logged”, never zero. Today is still in progress. Weight is a trend over weeks, not a daily verdict. And when there’s too little data, he says so instead of inventing a pattern. Our guide to keeping a food diary has tips for a better log.

What rules does Doy follow?

Doy’s everyday lines never contain numbers. A note does, because you asked for a closer read: it quotes calories, macros and trends where they help. The floor underneath stays the same:

• No shaming. No moral words for food, no guilt, no “you failed”.
• No body talk. Nothing about how a body looks.
• Never below your plan’s minimum. Doy never suggests eating less than your plan allows: 1,200 kcal on the female formula, 1,500 on the male. More in our calorie deficit guide.
• No fasting, no “earning” food. He won’t suggest skipping meals, or exercising to make up for a meal.
• Nothing medical. No diagnoses, no medication, no supplements. When the data call for it, a gentle note suggests talking to a doctor or a registered dietitian.

These aren’t just instructions to the model. Every note passes an automatic check before you see it: anything that breaks the rules, links elsewhere or mentions a date outside your chart is dropped, not patched. If what’s left isn’t a whole note, Doy says he couldn’t finish it, and you can ask again.

What does a note look like? An example week

Here’s an example of the style. Everything in it is invented and illustrative: an imaginary person with a daily target of 2,001 kcal and 150 g of protein, and a week made up for this post.

Notice what isn’t there: no red, no “over by”, no hint that Saturday was a mistake. Maybe it was a birthday dinner; either way, it was a fuller day, and the note looks at the week as a whole.

What does Doy do while he reads?

A note takes a little while to write, so the wait is a small show. Doy sits at a wooden desk with a mug and a flip chart, where your chart appears in pixels.

• He turns the pages of the period, and the chart builds up as he goes.
• He lifts his phone, flashes the board and reads, while little pixel sparks rise off the columns into the phone.
• Now and then he looks up and tells you something true he’s spotted, like how many days you logged, and those columns light up.
• When the note arrives, he puts the phone down, a folded pixel note appears in his hands and drops into his speech bubble, and gold flags mark the days the note talks about.

What Doy says while he reads is worked out on your phone from the chart itself, so even the wait tells you something real.

Can you chat with Doy about a note?

Yes. Under a note, Chat with Doy opens a conversation that starts from that note, with its three questions ready to tap, such as “What could a higher-protein Saturday look like?”

• Photos welcome. Add up to four photos to a message, like a menu or a plate.
• Portions as ranges. When Doy estimates a portion, he gives a range, not a falsely precise number.
• The same floor. The chat follows the note’s rules. Off-topic questions are steered gently back, and worrying signs such as fainting, chest pain or a hard time with eating are met with care and a nudge toward professional help.
• Honest about being AI. Ask Doy whether he’s an AI and he’ll say so: he’s the app’s AI companion. The line under the message box adds that he can make mistakes and isn’t medical advice.

Replies stream in as he writes. A thread holds up to 30 of your questions, and Doy writes up to 60 replies a day.

What happens to your notes and chats?

A note only exists because you asked for one, and it doesn’t stay forever:

• When you ask, the chart’s data and the plan context above are sent to Anthropic’s Claude to write the note; in a chat, your questions and photos go too. For a note, Doydum keeps only the finished note, not the prompt or the raw answer.
• Notes are kept for 30 days, then deleted.
• Chats are kept for 30 days after their last message, photos included, then deleted.
• Notes and chats are part of your data export, and they’re deleted with your account.

Insights need an internet connection, and Doy writes up to 12 notes a day. See our privacy page and health note for the full picture. To see how Doy reads a single plate, read how Doy reads your plate.

Questions people ask