This whole debate centers around epistemic authority (who we deem credible enough to trust). I've studied this professionally for years. The issue isn't credentials vs popularity - it's about appropriate domains of knowledge. A dietitian understands nutrition science but may not grasp the psychological/practical hurdles of weight loss that a successful fitness influencer has personally overcome. Conversely, that same influencer might spread dangerous nonsense about vaccine efficacy where formal training is crucial. Both can be valuable in their proper context! The real skill is knowing which source suits which problem