Yes hormones violate the laws of thermodynamics.

Yes being diabetic with poor insulin sensitivity can lead to increased conversion of glucose to triglycerides, making it difficult to drop weight, but being fat comes from too much food, period. Body fat isn't absorbed from the atmosphere.

Being fat isn't healthy period. You may be able to maintain some basic blood markers(electrolytes, cbc) in the normal range, but hormonal profiles will change. Increased aromatization of testosterone -> estrogen, decreased t4->t3 conversion, piss poor glucose uptake and increased homocysteine. Sleep apnea is also very common, and most people don't realize they are literally suffocating in their sleep.