How they’re alike:
Nutrition science and climate science share some common challenges: complex system(s) and many confounding factors. Severe tests for nutrition science can in principle be done, but they are very expensive and take decades. Severe tests for climate science require better observational evidence, particularly in the past.
When there’s no evidence to falsify what is merely a supposition,we are left with ”magical theories that explains absolutely everything – including diametrically contradictory phenomena, lack of logic and absence of evidence.”
There’s a lot of junk science associated with both.