Where are they getting so much food?!

In some place, especially developed countries, fast food are much cheaper than healthy food

Glandular problems, big boned people, recently became homeless, there are lots of reasons

Hamburger's a dollar, a salad is five.

They could be formally billionaires?

Also, if they were fat when they started, and they're not getting fed regularly, they're pretty much locked in. If your calorie intake goes too low, your body can go into starvation and will sometimes straight-up eat your muscles before it dips into those precious fat reserves, despite the fact that's clearly what they're for.

thyroid.

They could have became homeless very recently.

Homeless doesnt always mean hungry

They could have been fat before they became homeless.

A friend told me that a homeless person in our city refused an offer of food, saying people don't know how easy getting food is. Stuff like housing, mental health care, and addictions counselling, however...