Short answer: People with any difficulty swallowing, or a narrowing anywhere in the digestive tract, should avoid glucomannan products entirely — a direct, unconditional exclusion tied specifically to the fibre mechanism.
Why this exclusion is specifically tied to glucomannan's mechanism
Because this fibre expands on contact with liquid, a swallowing difficulty or digestive narrowing creates a genuine physical risk distinct from a general ingredient sensitivity.
Why this is stated as "entirely," not conditionally
Unlike some cautions suggesting a doctor conversation first, this one is a direct, complete exclusion for these specific physical circumstances.
⚠️ Worth knowing: anyone with a swallowing difficulty or digestive narrowing should not use it without medical supervision — worth taking this specific exclusion seriously.