Keirsey actually called ESFPs the Bingers and ISFPs the Derelicts. Still ISFPs would be the second most likely to binge, I guess, in according to Keirsey groupings.
I think some ISFPs might have extra weight on them either because an aesthetic love of food or dining or cooking as a past time, like food and/or cooking as an art form; also possibly due to the ISFP need for comfort, they might often "decompress" from socializing or responsibility by doing things like snacking while watching movies or reading or listening to music alone.
Se types in general may assuage boredom or comfort themselves with things like food or alcohol, or whatever kind of sensory pleasures they can afford: that means Se types with the extra money and an aversion to food might instead "binge" on shoe shopping, for example.
I'm sure there are ISFPs who don't care for food as much, individuals can direct their Se in different ways, and I'm sure a lot of ISFP actresses aren't allowed to gain much weight, so what, are they all bulimic? Some might be, but I'd guess they would just focus their Se into spending excessively on clothing, cosmetics, alcohol, etc.
I was a slender child and am genetically large-chested so around puberty I started putting on some weight; the thing is that I have always been active so despite any love of eating I have, I tend to be firm and voluptuous rather than "fat." The only time I was truly ashamed of my weight actually had to do with medication affecting my metabolism, an anti-depressant called Lexapro.
I also won't take birth control pills. Anything that slows down my metabolism is bad because of my love of food, it's my natural revved up metabolism and love of activity that keeps me from being the stay-puff marshmallow woman, because lord knows it's nigh impossible for me to stay on a restrictive diet.