To add onto this, I have no problem with someone who is actually diagnosed with a medical condition that leads to their obesity. A failing thyroid gland, diabetes, etc etc. Though, many of these conditions are due to poor lifestyle choices.
Agreed there are conditions like this, 90% of people claim thyroid issues when they're just lazy shits. Many people have thyroid issues DUE to their obesity which make it a more serious issue that is harder to overcome.
Diabetes does not make you fat.
Those saying well some are predisposed to be harder to lose weight, you are full of shit. If you do not eat excessive calories and you burn off the ones you do eat, it is impossible to gain. People are not perpetual energy devices.