One of the things I worry about, with all of these "substitutes" is that using them sometimes goes against a big part of the reason why my wife and I are vegetarians.
Our decision to go this way was prompted by our minister:
... I hadn’t given much thought to where our food comes from or what impact our food has on the larger world. Sure, I spent 15 years as a vegan—eating no meat or dairy. And lately, though I’ve become a bit more flexible, eating lots of fish and even an occasional chicken wing or burger, I still didn’t give my food’s origin or treatment much thought. I didn’t raise an eyebrow when my partner Jim, who does the grocery shopping, would bring home fresh strawberries in February, flown in from South America. I didn’t think twice as I ate fresh blueberries in January, flown in from Mexico. I didn’t think that there was something unnatural or destructive about eating food that wasn’t in season. It simply tasted good, and I have always been a fan of immediate gratification. I didn’t think about what it was doing to our environment. I didn’t think about the industrial induced methods of growing that infused the food I was eating with chemicals and pesticides and genetically altered science. I didn’t think about how I was lining the pockets of multi-national corporations, contributing to our dependency on Middle East oil, condoning abusive treatment of animals, or contributing to the exploitation of third world countries and migrant workers. I just liked food that tasted good.
Folks who know me, here, know I don't have a problem with "multi-national corporations" making money, but I also don't have a problem with people making a personal decision to care about where their food comes from, what impact certain foods have upon the Earth, and what impact eating foods that have to be transported over great distances has upon the Earth.
Tim went on to quote Rev. Alison Wohler:
While we would like to think, and often do think, with our independent human personalities, that what we eat is our own business, the truth is what I eat, what you eat, has further reaching consequences than merely staying alive and being healthy. In this world of finite connections, our interdependent web, there is no such thing as an isolated event, and because of that fact it matters what we do. It matters what we eat. It matters where our food comes from. It matters how it’s grown. It matters how an animal is slaughtered. It matters that eating food that has been transported long distances is contributing to the greenhouse effect. It matters that raising livestock produces copious amounts of methane. It matters if the food we are eating was harvested by people being paid less than a living wage. Nothing is an isolated act.
He also quoted Rev. Duane H. Fickeisen:
It might be a stretch for most of us to become locavores, eating only (or almost only) foods that [are] grown locally. But . . . you could start with one meal a week from mostly local sources, or with a single celebratory meal. Or you could find . . . five items on your regular shopping list that you could replace with locally grown whole foods. Or make it a habit to shop at one of the farmers’ markets . . . .By choosing to eat more locally produced food and more whole foods, we’re also choosing to do a little less damage to the Earth by our living here.
And that brings me back to my earlier concern about these "substitutes". They are,
necessarily processed food products. Again, folks who know me here know I don't have a problem with GMOs, even, so I surely don't have a problem with processed foods, on principle. However, processing doesn't happen here in Burlington (at least not all processed foods are made here

). Processing happens somewhere else, and so whatever they need to make the "substitute" has to be shipped to the processing facility, and then shipped to my town.
Shipping is what I am concerned about: The conversion of scarce fossil fuels into pollutants simply to move food around, when there is practically enough food
already here.
And I don't want to lose sight of Rev. Fickeisen's comments that moderate the extreme perspective we could take. Eating locally is a positive influence on the world,
in each measure -- it is
not necessary to do it 100% to have the positive effect we desire to foster. So surely we'll be eating "substitutes" -- probably a good amount, but I'm going to be thinking about this issue of eating locally whenever I make a purchase of a "substitute".
For me, personally, because of choices I've made for myself (similar to the choices that Rev. Kutzmark has made, coincidentally), I'd sooner eat "real" shellfish than eat a substitute, balancing the damage I do by eating a living being against the damage I do by eating a processed food product -- a "substitute". Each of us need to make our own decisions along those lines, though, and more power to those who choose a more purely vegetarian approach.
(PM me if you want a link to all of Tim's comments on this.)