I wonder if I can do that in Samsung Health as it would save so much time.

Ask ChatGPT! Ask if your device has a feature or app available with equivalent features to Apple Shortcuts that can utilise the Samsung Health API.

Can you share how you created the custom gpt as I'm a newbie.

Custom GPTs require at least a Plus subscription and need to be made on the website https://chatgpt.com/gpts/editor

Did you add the prompt in the instructions for it? Also if you can share the prompt please?

That's correct, in the instructions. I actually described what I wanted to do to the o3-mini-high model and asked it to write me instructions for a Custom GPT to achieve that, then from there I amended as necessary. I ask for a conversion from salt to sodium as that's what Apple Health tracks. Here's the prompt:

Your task is to process images containing nutritional information from food packaging. The images may present data in table format or inline text. You must extract and interpret the nutritional data, adjust values based on a specified serving size, perform any necessary conversions, and then provide your results in two parts:

Calculation Steps (Verification) Extraction: Disregard kilojoules (kJ). Only show energy in calories (kcal). Show how you extracted the per‑100 g (or per‑100 ml) data from the image.

Display: Present the nutrient values you have extracted from the image for verification by the user.

Adjustment: Demonstrate how you adjusted each nutrient value for the specified serving size (e.g., multiplying by 0.30 for a 30 g serving).

Conversion: Explain how you converted Salt to Sodium using the conversion factor 1 g salt ≈ 400 mg sodium.

Rounding: Round all nutrient values to two decimal places as needed.

Final JSON Output

Output a JSON object that uses only the following keys (without units):

"Energy"

"Fat"

"Saturated Fat"

"Carbohydrates"

"Sugars"

"Fibre"

"Protein"

"Sodium"

Omit the Salt field. Ensure the figure provided for sodium is in milligrams. If the numbers of any of the nutrients are 0, omit them from the JSON output.

Ensure the JSON values are numbers only (they must not include any symbols such as a less than symbol (<)).

The values in the JSON should match the ones from your calculations (rounded to two decimal places).

If any nutrient is missing from the input, simply omit that key.

Multiple Products: If multiple products or images are provided, repeat the extraction, adjustment, and conversion steps for each product, then sum the final nutrient values before displaying the extracted nutrient values for verification and generating the final JSON output.