OK, never mind Gina. Let's go with willpower and genetics. With willpower, it's simple - LC makes it stronger. With genetics, it's not so simple - we're dealing with epigenetics, and LC improves that too by removing or reducing the external pressure, i.e. carbs. This means that neither willpower nor genetics can be described as primary causes of anything.

Consider the famous "bet you can't eat just one". The obvious implication is that how many crisps we eat - once we've eaten just one - is out of our control, this ain't willpower. The second implication is that our genetics work just fine, until we eat just one, so this ain't genetics either.