Final answer:
The most concise and informative revision is option C, which addresses the lack of nutritional content and the risks associated with high calorie intake in junk food.
Step-by-step explanation:
The most concise revision of the passage, which encapsulates the main concerns with junk food consumption, would be option C: Junk food is not ideal for regular consumption because it has little nutritional content and excessive calories, which may lead to health issues.
This option clearly conveys that junk food lacks essential vitamins and minerals such as vitamin A and calcium, which are key to maintaining health. It also makes the connection between high calorie content and potential health problems without being repetitive or overly wordy.