[nonbel]

First study:

>"During the test phase, high, moderate, and low carbohydrate diets varied in carbohydrate (60%, 40%, and 20% of total energy, respectively[...]We randomly assigned participants who achieved the target weight loss to high, moderate, or low carbohydrate test diets for a 20 week test phase.)"

Second study:

>"14 days of a low-carbohydrate diet (21 g of carbohydrates per day)"

So the first study went for 5 months but didn't include an actual low-carb diet:

  100 g -> ~400 cal -> ~20% of 2k cal/day

The second study only went for 2 weeks but did include a low carb diet:

  21g -> ~84 cal -> ~4% of 2k cal/day

Now someone just needs to combine these methods into one valid study.