Bean There
“They always need soaking.”
The science behind the song
"Bean There" is built around a small, recurring kitchen truth: dried legumes need a long soak before they're cooked. Soaking does two useful things. It shortens cooking time considerably, since the beans have already taken up water before they hit the heat, and it leaches out some of the raffinose-family oligosaccharides that resist digestion in the small intestine and are largely responsible for the gas associated with eating beans, since they're fermented further down the gut.
Soaking, and discarding the soaking water, also reduces phytic acid, a compound in legumes that can bind minerals like iron and zinc and reduce how much the body absorbs. None of this is dramatic chemistry, it's just the quiet, practical reason a note in the song reads "they always need soaking," underlined with a heart rather than a warning.
Key terms
Raffinose. A type of oligosaccharide (short-chain sugar) found in beans, lentils, and other legumes. Humans lack the enzyme needed to break it down in the small intestine, so it passes intact to the colon, where gut bacteria ferment it, producing gas as a byproduct. Soaking and discarding the soaking water reduces raffinose content.
Phytic acid (phytate). A compound found in seeds, grains, and legumes that binds to minerals such as iron, zinc, and calcium, reducing their absorption in the gut. Soaking, sprouting, and fermentation all reduce phytic acid levels. It is sometimes called an "anti-nutrient," though it also has antioxidant properties, and its effects depend on the overall dietary context.
Oligosaccharides. Short chains of sugar molecules found in many plant foods, including legumes, onions, and garlic. They resist digestion in the upper gut and reach the colon intact, where they are fermented by resident bacteria, acting as a prebiotic food source.