There is no doubt that vegetarian food can be healthier than a traditional diet  indeed, research has demonstrated that vegetarians are less likely to suffer from heart disease and obesity than those who eat meat. One long-standing concern about a vegetarian lifestyle is the risk of failing to take in enough protein. However, historical calculations as to the amount of protein needed for a healthy lifestyle have recently been shown to overestimate the quantities needed, and if vegetarian select their food carefully they should be able to meet their protein needs.

Question: A balanced diet is more likely to promote health than any particular food or food group in isolation.
Options:
A. true, B. false, C. uncertain
Answer: "C"