I can't find specific information, but it will be much less than combat with most monsters. Normally you should have time enough to get to safety. On the other hand, your health will gradually go down, so better take enough waterskins with you. Those will last much longer than food.
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Bread heals 5 hitpoints.
In RuneScape a Lobster heals 120 HP!
The price of normal monthly Runescape membership for your country x12.
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