Typical addictive behavior - the three pizza apps. She basically admitted she orders a lot pizza. Because, if that was not the case, she would not have to cycle through the apps to prevent any one place from knowing how many she orders, right? Addicts hide their use of the substance so that no one can see how much they use. She is a textbook case.
The first step to any recovery is realizing that your addiction has made your life unmanageable. Buddy is very much aware of how his weight is affecting his life. And I think Buddy and Tal understand more than the others Whitney's denial. Frankly, I think Buddy would like to say a lot more but he's avoiding the confrontation and he knows it's pointless.