We cannot provide a rewritten article given that the input contains no substantive content to rewrite—only the repeated phrase:
"How to understand the nutrition facts on food labels · How to understand the nutrition facts on food labels."
There is no factual information, explanation, data, or context about nutrition labels, dietary guidelines, serving sizes, daily values, or any health-related details that could be used to construct a news article in Spanish for the Salud category.
Since the instruction requires using only the factual information provided, and no such information exists beyond the repeated title-like phrase, there is no basis for generating a valid news article body.
no output can be generated that satisfies the requirements without inventing content, which is strictly prohibited.
No valid article body can be produced from the given input.