Consumer Health Data Privacy Policy

Saturday: Pro Fuel & Hydration App — Effective March 11, 2026

Saturday Inc. ("Saturday," "we," "us") provides this Consumer Health Data Privacy Policy pursuant to the Washington My Health My Data Act (RCW 19.373, "MHMDA"). This policy is separate from our general App Privacy Policy and applies specifically to consumer health data as defined under the MHMDA.

Saturday is a sport nutrition platform that delivers personalized fuel and hydration prescriptions for endurance athletes. We collect health-related data for one reason: to improve the precision of fuel, hydration, and electrolyte recommendations for each individual user. Every data point we collect directly contributes to more accurate, safer, and more effective prescriptions.

Saturday does not sell consumer health data. Saturday does not use consumer health data for advertising. Saturday does not share consumer health data with data brokers.

1. Categories of Consumer Health Data Collected and Purpose

We collect the following categories of consumer health data. Each category exists to improve the personalization and accuracy of your nutrition and hydration prescriptions.

Body Composition and Biometric Data

Biological sex — Used to calculate sweat rate and sodium loss, which differ meaningfully between sexes.
Year of birth — Used to estimate basal metabolic rate and age-adjusted physiological parameters.
Body weight — Core input for all fluid volume, electrolyte, and caloric calculations. Prescriptions are weight-dependent.

Physiological Self-Assessments

Sweat level (1–9 scale) — Personalizes fluid volume recommendations based on your perceived sweat output.
Saltiness of sweat (1–9 scale) — Personalizes sodium concentration recommendations based on your perceived sweat sodium content.
Fitness level (1–9 scale) — Affects metabolic rate estimates and exercise capacity assumptions used in prescriptions.
Satiety level (1–9 scale) — Adjusts intake timing and volume recommendations to match your fullness patterns.
Craving level (1–9 scale) — Adjusts intake recommendations to account for appetite-related factors during exercise.
Weight loss preference (1–9 scale) — Adjusts caloric recommendations to align with your body composition goals.

Sensitive Health Data

Eating disorder flag (yes/no) — When indicated, this adjusts how recommendations are presented to avoid triggering content and applies a modified recommendation approach. This data is stored with the same security as all other health data and is never shared with third parties beyond our infrastructure provider (Google Cloud).

Fueling Concerns and Symptoms

Fueling concerns (gut distress, muscle cramps, faintness, heat tolerance, hunger, thirst, drinking resistance, performance) — Each concern adjusts specific aspects of your prescription. For example, gut distress triggers more conservative carbohydrate loading; muscle cramps increases sodium recommendations.

Nutritional Parameters

Maximum carbohydrate intake range — Sets a safety ceiling to prevent recommendations that exceed your gut tolerance.
Usual carbohydrate consumption — Establishes your baseline so recommendations progress gradually rather than causing gastrointestinal distress.

Activity and Performance Data

Activity type, duration, intensity, and thermal stress — Required inputs for calculating fluid loss, electrolyte depletion, and caloric expenditure during exercise.
Nutrition consumed during activity (carbohydrates, sodium, fluid) — Used to evaluate adherence to prescriptions and refine future recommendations.
User ratings and notes on activities — Enables feedback-based refinement of prescriptions over time.
Swim PR (personal record) — Used for performance calibration to scale exercise intensity estimates.

Location Data (Transient)

GPS coordinates — Sent to a weather service to obtain temperature, humidity, and heat index for your location. These environmental conditions directly affect sweat rate calculations. GPS data is transmitted transiently and is not stored in our database; it is cached only on your device.

Third-Party Fitness Data (User-Initiated)

TrainingPeaks data — Workout data and profile information (name, email, weight, sex, birth month) synced when you connect your TrainingPeaks account via OAuth.
Intervals.icu data — Workout events and activity data synced when you connect your Intervals.icu account.

AI-Processed Data (User-Initiated)

Nutrition label photos — When you photograph a nutrition label for scanning, the image is sent to an AI service for text extraction. The extracted nutritional information is used to populate product data for your activity fuel planning.

2. Categories of Sources of Consumer Health Data

Directly from you — Profile setup, onboarding questionnaires, activity logging, in-app data entry, and photo scans you initiate.
From your device — GPS coordinates (with your permission) for weather-based sweat calculations.
From third-party fitness platforms you connect — TrainingPeaks and Intervals.icu, when you explicitly authorize the connection via OAuth or API key.

3. Categories of Consumer Health Data Shared

We share consumer health data with third parties only as necessary to operate the app and deliver your personalized prescriptions. We do not sell health data. We do not share health data for advertising purposes.

All health data categories listed above — Shared with our cloud infrastructure provider for storage and processing (see Section 4).
Sex, fitness level, and sport type — Shared with our email communications provider so that email content about app features is relevant to your sport and experience level.
Workout and nutrition data — Shared bidirectionally with TrainingPeaks and/or Intervals.icu only when you have connected those accounts.
GPS coordinates — Shared transiently with a weather data provider to obtain local environmental conditions. Not stored by Saturday.
Nutrition label photos — Shared with an AI text extraction service when you initiate a label scan. Photos are processed and not retained by the service.

4. Third Parties and Affiliates Receiving Consumer Health Data

The following is a complete list of third parties that receive consumer health data from Saturday, identified by name and category:

Infrastructure Providers

Google Cloud (Google LLC) — Cloud infrastructure provider. All consumer health data is stored in Google Cloud Firestore and processed via Google Cloud services. Google processes this data as a data processor on our behalf under a Data Processing Agreement.

Communications Providers

Klaviyo, Inc. — Email communications platform. Receives sex, sport type, fitness level, and seriousness level so that product emails are relevant to your use of the app.

Third-Party Fitness Platforms (User-Initiated Only)

TrainingPeaks (Peaksware, LLC) — Receives and provides workout and nutrition data via bidirectional sync. Only active when you connect your account.
Intervals.icu — Receives and provides workout and activity data via bidirectional sync. Only active when you connect your account.

Data Services (Transient Processing)

OpenWeatherMap (OpenWeather Ltd) — Receives GPS coordinates to return weather forecasts. Coordinates are transmitted transiently for the purpose of calculating weather-adjusted sweat rates.
Google Gemini AI (Google LLC) — Receives nutrition label photos for text extraction when you initiate a label scan. Images are processed and not retained.

Affiliates

Saturday Inc. has no parent companies, subsidiaries, or corporate affiliates that receive consumer health data.

5. Your Rights Under the MHMDA

If you are a Washington state resident (or otherwise covered by the MHMDA), you have the following rights regarding your consumer health data:

Right to Confirm and Access

You have the right to confirm whether Saturday is collecting, sharing, or selling your consumer health data and to access that data.

Right to Withdraw Consent

You have the right to withdraw your consent to the collection and sharing of your consumer health data at any time. Withdrawal of consent may limit or eliminate our ability to provide personalized prescriptions.

Right to Delete

You have the right to request deletion of your consumer health data. Upon receiving a verified deletion request, we will delete your health data and direct all processors and third parties that received the data to do the same.

Consent Duration and Renewal

Your consent to the collection and sharing of consumer health data is valid for one year from the date you provide it. We will request renewed consent before the expiration of each one-year period. You may revoke consent at any time before the one-year period expires.

How to Exercise Your Rights

To exercise any of these rights, contact us by any of the following methods:

Email: [email protected]
In-app: Navigate to Settings > Account > Privacy

We will confirm receipt of your request within five (5) calendar days and respond substantively within forty-five (45) calendar days. If we need additional time, we will notify you of the reason and the expected completion date.

We will not discriminate against you for exercising any of these rights. However, withdrawal of consent for health data collection may prevent us from providing personalized fuel and hydration recommendations, as these recommendations depend on the data described in Section 1.

Right to Appeal

If we decline to take action on your request, we will inform you of the reason and provide instructions for how to appeal the decision. You also have the right to file a complaint with the Washington State Attorney General.

Changes to This Policy

If we make material changes to this Consumer Health Data Privacy Policy, we will notify you via email and/or in-app notification before the changes take effect and request renewed consent where required by law.

Contact

Saturday Inc.
8 The Green, STE A
Dover, DE 19901
[email protected]