Well, we hereby invite you to design, fund, run, analyze, and publish a bigger one!

Science gets done by doing things. Doing science has the same challenges as doing anything: time, money, resources, priorities, etc.

Science is rarely advanced through simple critiques like "your sample size should ideally be bigger."

No. This is a preliminary study of a new fasting method. There is no-one who is deliberately spreading this on social media to advance their own political situation.