It is common knowledge that many foods naturally or through processing contain high levels of sodium while remaining low in fat, such as broths, pretzels, soy sauce, and certain canned vegetables or soups.
The claim that certain foods are high in sodium while remaining low in fat is a matter of everyday observation regarding the nutritional profile of various food items (e.g., pretzels, fat-free broths, and certain condiments). No specific academic citation is required for this basic nutritional fact.