isn't eat cholesterol ?

it*

yes lower cholesterol. I'm asking if it helps with weight loss?

yes.

how?

lots of fiber, so you wont overeat, and so you will shit all the fiber out, so less calories

"Oats contain more soluble fiber than any other grain, resulting in slower digestion and an extended sensation of fullness."

hmmm not sure about oats... but cutting sugar (or at least being really careful) and watching my portions help me a lot