Give the entry a purpose
The note, mood, and weight fields are independent choices. You can keep a rich contextual journal while leaving the optional measurement empty on every session.
Write and save deliberately
Choose a mood when it helps and write a short sentence about the circumstances. Save with an empty weight field; there is no need to add a placeholder number.
Archived sessions retain their journal fields and are included in JSON backups. Moving a record out of the main list therefore does not remove its private wording from the device or from a new export.
Use a concrete example
Your exported record can still contain start, end, protocol, goal, note, and mood. Omitting weight does not remove those other fields or prevent the session from appearing in the Journal tab.
Read the note in context
Decide based on what you want your log to contain. The presence of an optional field does not establish that collecting it is necessary for your use of the app.
Fastly is a lifestyle timer and journal. These notes explain the app and offer reflection prompts. They are not medical advice or a prescribed eating schedule.