You'll lose weight as long as you do negative energy balance, despite whatever it is you stick in your gob. Doesn't mean it's good for you.
A better question to ask- Is a high carb low fat vegan diet good for weight loss, gain, and maintenance; athletic performance; longevity; reversing the morbidity of rubbish diets; and psychoemotional stability?
Could every human tolerate a vegan diet? probably not, because their parents didn't feed them a healthy diet when younger, when some hard wiring and metabolic pathways are kindled for food preference....and then there's a % who have deranged endocrine function that can start before they are born, due to their parents' eating preferences.
Until I worked in the field I had no idea how ubiquitous non-unprocessed vegetable eating is in Australia. It was inconceivable to someone from my generation and upbringing. Obviously there's a lot of parenting by people who are more ignorant about healthy eating than Neanderthals.
Anyway, I appreciate the gang thinks I don't know what I am talking about, so read Harvard School of Public Health's word instead.
http://www.hsph.harvard.edu/nutritionsource/pyramid/" onclick="window.open(this.href);return false;
"2. Go with plants.
Eating a plant-based diet is healthiest. Make half your plate vegetables and fruits. Cook with healthy plant oils, like olive and canola oil. Get most or all of your protein from beans, nuts and seeds, or tofu."
Yeah I note their use of processed plant oil, but that doesn't necessarily mean they recommend a high fat diet.
The haters are always raising that many vegans and vegos are unhealthy. It's been shown over and over in the literature that lots of sick people experiment with diet to get better. And many unwell people choose a vego diet, and don't plan it well. This is very common for teens, especially when their parents have no idea what a balanced diet is in the first place.
I think the problem is there's too many people who believe diet is the solution to most of mankind's health issues. Certainly has its role, but things like good family, sleep, friendships, meaning of life, education, all have their role. Take Oscar Pistorious for instance. Obviously a fit low fat supremely athletic guy, but.......