02 — Apple Watch

Allergen alerts on your wrist.

Most Apple Watch nutrition apps show a calorie count. This one taps you when a logged food is high in histamine or carries hidden gluten — and lets you log a recent meal without reaching for the phone. Included free with the iPhone app.

Download on the App Store How voice logging works

Series 4 and later, SE and Ultra

watchOS, for complications

Complication slots supported

No separate purchase

On the wrist

A glance, and a tap when it matters.

The Watch app shows today's calories and macro split, and the day's cumulative histamine load. Log from favourites or recent entries in a single tap. Everything written on the Watch syncs to the iPhone for the full breakdown.

Apple Watch app: 762 kcal left of a 2,000 kcal goal, with protein, carbs and fat for the day — Calories left, macros and today's meals on the Watch; anything logged on the wrist lands on the iPhone with the full analysis.

Apple Watch app: today's meals, each with its calories and the time it was logged — Calories left, macros and today's meals on the Watch; anything logged on the wrist lands on the iPhone with the full analysis.

What the Watch app does

Daily nutrition summary

Calories against your target, protein, carbs, and fat, plus the day's running histamine load — on one screen with a raise of the wrist.

Haptic allergen alerts

A tap when an entry contains one of your flagged allergens, a high-histamine or histamine-liberating food, or a hidden source of gluten. You feel it without looking.

One-tap logging

Favourites and recent meals are on the Watch, so a repeat breakfast is one tap. Siri works too: “log a banana” records it without a screen.

Watch face complication

Today's calorie count in a modular, circular, or infograph slot on any face, so the number is there before you open anything.

Apple Health, both directions

Calories, macros, and micronutrients are written to Apple Health; activity data is read back, so intake is shown against how active the day actually was.

Also worth knowing

Works away from the phone

Logging from favourites and recents runs on the Watch alone. Voice and photo analysis needs the iPhone, and syncs back when it is in range.

During a workout

Nutrition stays visible alongside Apple Fitness sessions, so pre- and post-workout fuelling is a glance rather than a calculation.

Local and offline

Watch data is processed on the device. No account, and no connection needed to read your own numbers back.

Questions

Which models are supported?

Series 4 and later running watchOS 7 or newer — Series 4 through 10, SE first and second generation, Ultra, and Ultra 2.

Can I log without my iPhone nearby?

Yes, from recents and favourites. Voice and photo entries are analysed on the iPhone, then sync to the Watch automatically once it is in range.

Do histamine and gluten ratings appear on the Watch?

Yes — as notifications and in the Watch app summary, including the cumulative histamine load for the day and an immediate alert on a high-histamine or gluten-containing entry.

How does it use Apple Health?

Calorie, macro, and micronutrient data is written to Health; activity data is read back so intake can be read against how active you have been. Both directions are permission-gated.

Is the Watch app a separate purchase?

No. It is included with JustAddTofu for iPhone at no cost, with no subscription.