Personal thresholds
From the app’s English Help & Guide · Reference release 1.0.12
Many foods aren’t binary. You might tolerate one slice of bread but not three. Personal thresholds capture both a safe amount and a trigger amount, so your rotation respects the line rather than guessing.
Be concrete. “1 slice”, “¼ cup”, or “75g” is easier to compare later than “a little”. A threshold records what you observed; it is not an allergy limit or a guarantee.