Which foods are reliably rich sources of inulin as highlighted in the lesson?

Cooked lean meats and egg whites because animal proteins convert to inulin during digestion and reach the colon intact.

Fresh citrus juices and peeled cucumbers are concentrated inulin sources that primarily reach the colon unchanged.

Refined white bread and glucose syrup are primary sources of inulin and provide high inulin content per serving.

Root vegetables such as onions, garlic, and chicory are reliable inulin sources.