I think this method of actually measuring and cataloguing the food consumed instead of relying in a poll is the way forward.

We should repeat this kind of studies. This methodology should be encouraged.

I just have a small doubt about a particular point: it mentions 'a very low carbohydrate ratio'.

But this is not clear at all.

Is 30% of carbohydrates very low? So far some studies actually claim this.

Is it 5% of carbohydrates, like the ketogenic diet proponents claim is necessary to be in a ketogenic state?

For me, the proportion of carbohydrates that can be considered very low actually makes too big a difference to not to dive further.