Final answer:
No, the statement is false. Water in the human body does not come only from dietary sources.
Step-by-step explanation:
No, the statement is false. While water is an essential component of the human body, not all water in the body comes from dietary sources. Water is obtained through various processes, including metabolic generation, and is lost through different routes, such as urine, sweat, and exhaled breath. The kidneys can regulate water levels in the body, conserving water if a person is dehydrated and expelling excess water if necessary.