I am a past patient of Matia and became a Gaps practioner about 1 year ago.  There is a lot similar to both programs.  Matia has a broader view that incorporates ancient chinese concepts I do not fully understand, but believe are crucial to healing the immune system.  Natasha is wonderful too, training in nutrition and neurology both.  Both have spent 20 years trying to help people and have found success in their own ways.  I think both are wonderful, passionate, and committed.