Cravings come and cravings go, and sometimes they stay for days, weeks. Not easy to not eat, and yet know one claims to have the answers.
Too much carbohydrate definitely results in cravings. Lustin's explanation, insulin blocks leptin signaling, and leptin is the satiety hormone, is the most likely explanation.
Too little intake of energy, fat or carbohydrate causes a first pass feeding of the gut hunger. A bit of fat or fat and protein removes that. For me, this occurs any time after three hours. Others suggest it should not happen for 5 to 6 hours.
Too little carbohydrate also causes cravings, severe cravings. Dr. Richard Bernstein, at 30 grams does not talk about the cravings. So I suspect it is not universal. Inositol has been suggested as the cause, and cantaloupe, the most available natural inositol helps, but by then I am well over 30 grams of carbs. Potatoes also help, but only boiled and cooled, to produce a bit of resistant starch. This suggests that there is a craving free window of opportunity.
Expression of these issues also helps. But what do I know. Breath, simile and enjoy what life has to offer. Dao.