Does a vegan diet feed the ego?

The venerable Dayamati, aka Professor Richard Hayes, has a provocative post (“How to feed an ego“) about the tendency for vegans (and to a lesser extent vegetarians) to cling to a notion of “us versus them” purity that reinforces a sense of identity rather than weakens it.
After mentioning a radio program discussing factory farming, he goes on to say:
One of the observations that most caught my attention in these discussions was made by a woman who was a vegan for 20–30 years and eventually changed her diet to include some animal products. She observed that being a vegan is much more than deciding what to eat and what not to eat. It is also taking on an identity. It is carrying all the baggage of a persona that must be defended almost every time one picks up
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UN urges global move to meat and dairy-free diet

This is very encouraging. Eventually we have to face the reality of how insane the meat industry is.
A global shift towards a vegan diet is vital to save the world from hunger, fuel poverty and the worst impacts of climate change, a UN report said today.
As the global population surges towards a predicted 9.1 billion people by 2050, western tastes for diets rich in meat and dairy products are unsustainable, says the report from United Nations Environment Programme’s (UNEP) international panel of sustainable resource management.
It says: “Impacts from agriculture are expected to increase substantially due to population growth increasing consumption of animal products. Unlike fossil fuels, it is difficult to look for alternatives: people have to eat. A substantial reduction of impacts would only be possible with a substantial worldwide diet change, away from animal products.”
Professor Edgar Hertwich, the lead
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