Final answer:
The assertion that ghrelin is the sole hormone stimulating food intake is false; there are multiple hormones, like leptin and serotonin, that regulate hunger and satiety. When hungry, ghrelin levels increase while leptin decreases, signaling the need for food intake. Problems like bulimia can damage teeth enamel due to stomach acid exposure.
Step-by-step explanation:
The statement that ghrelin is the only hormone in the body that stimulates food intake and feeding is False. Ghrelin, often called the 'hunger hormone', does indeed stimulate appetite and increases food intake, but it is not the only hormone involved in this process. Other hormones and neurotransmitters play a role in regulating hunger and satiety as well, such as leptin which signals satiety, and serotonin which generally has an inhibitory effect on eating. Hormones regulate digestion by signaling the brain about the state of fullness or hunger through different feedback loops. When you feel hungry, typically your ghrelin levels are high while leptin levels are low, indicating to your brain that it's time to seek food. Conditions such as eating disorders, particularly bulimia, are most likely to affect teeth enamel due to repeated exposure to stomach acid from vomiting.