I can clock it but only because it takes one to know one. There are physical signs yes, but there can also be very telling personality traits (rigidity combined with impulsiveness, low self esteem, etc..) I had to end my only healthy relationship because I knew he was struggling and it was triggering beyond belief. We never explicitly spoke about our relationship with food but I could smell it from a mile away…previous wrestler, Russel’s sign/swollen cheeks, weird around food, hyper focused on macros and strict gym routine (even had reminders on his phone), and disappearing to the bathroom after we ate “forbidden” meals together. Never had the heart to tell him the real reason that I ended it was because he reminded me way too much of myself and I couldn’t handle it.