Which food is a poor source of B vitamins?

Refined sugar is a poor source of B vitamins because it is primarily composed of simple carbohydrates with no significant nutritional value in terms of vitamins or minerals. Unlike whole grains, leafy vegetables, and meat and poultry, which provide a variety of B vitamins that are essential for energy metabolism, cognitive function, and overall health, refined sugar lacks these nutrients entirely.

Whole grains, for instance, are rich in B vitamins such as thiamine, riboflavin, niacin, and folate. Leafy vegetables also contribute key B vitamins, particularly folate, which is important for DNA synthesis and repair. Meat and poultry are good sources of several B vitamins, including B6 and B12, which are critical for various metabolic processes.

Thus, while whole grains, leafy vegetables, and meat and poultry are nutritious foods that support B vitamin intake, refined sugar provides no such benefits, making it the clear answer as a poor source.