I just picked up the book, The End of Overeating by David Kessler, who used to head up the FDA. Here is a quote from Publisher's Weekly about the book:

"Conditioned hypereating is a biological challenge, not a character flaw, says Kessler, former FDA commissioner under presidents Bush and Clinton). Here Kessler (A Question of Intent) describes how, since the 1980s, the food industry, in collusion with the advertising industry, and lifestyle changes have short-circuited the body's self-regulating mechanisms, leaving many at the mercy of reward-driven eating."

I have not started reading it yet. I just heard Kessler interviewed on the radio. But the questions about who is "at fault" I think are important because they help us realize that resisting overeating, just like resisting plastic, is not a matter of individuals "being good" but about fighting a systematic plan by companies to keep us entrapped in these unhealthy habits.

That is exactly the feeling I have, I have been turning to drinks instead of actual food. A nice cup of tea, of course as you also stated there is plastic in the tea wrappers but I am not at a point to give that up yet.