The term secondary market is also used to refer to the market for any used goods or assets, or an alternative use for an existing product or asset where the customer base is the second market (for example, corn has been traditionally used primarily for food production and feedstock, but a second or third market has developed for use in ethanol production).
What you eat with your carbohydrates matters, too. Protein and fat slow the absorption of glucose into the bloodstream, which helps prevent [insulin] spikes and drops, says Jamieson-Petonic.
But protein is not like carbohydrates. Carbs raise postprandial glucose levels in addition to insulin levels, whereas protein intake, paradoxically, raises insulin temporarily but does not raise glucose levels much. Ergo, gurus who want to vilify protein are really barking up the wrong tree.