Well I don’t think they’re fat but the inter webs are saying they’re porky.
Jus had the drama of weighing my boys (so many bowls before we found one they’d fit in!) and one weighs 1290g and the other is 1339g. They’re a few weeks off 1y of age so still have growing time. 
They are chubby as all good pigs are and I don’t think they’re overweight but I might be blinded by love. Their food is weighed every time, they get 50g of veg a day (okay, okay I admit it, they also get a midnight snack!) and just 15g of pellets each (plus unlimited hay and water).
They have 20 sq ft of floor space (plus 6.5 sq ft of loft space) so have room to run.
Do they need to be on a diet?
I think they’re just big fellas but I know you’ll give it to me straight.
Here a pic I just took of Hamlet, he of the 1339g weight. He’s super long and giant but well proportioned, don’t you think? Sorry for terrible photo quality.
Here’s a pic of him reenacting the Jaws poster just because it made me laugh. 