If a diet eliminated all carbohydrates, the most accurate statement from the options provided is:
Item 19: The body would use stored fats and proteins for energy, leading to potential muscle breakdown.
When carbohydrates are eliminated from the diet, the body shifts to utilizing fats for energy through a process called ketosis. However, without sufficient carbohydrates, the body may also break down muscle protein to produce glucose through gluconeogenesis to meet energy demands, particularly for those processes that require glucose (such as certain brain functions). The other options are not accurate in regards to complete carbohydrate elimination.