In terms of lbs on the scale it makes zero difference what you eat. 1000 calories of chicken and rice is the same as 1000 calories of ice cream in that regard.
You have to consider the effect of chicken and rice on blood sugar and insulin. It does, in fact, make a difference.
I've been experimenting a lot the last couple of years in my attempt to lose the baby weight. I'm more of a middle of the road eater.
When I was pregnant with my first child, we were mostly vegetarian - would only cook/ eat meat a couple of times a month. I ate similarly a few years later while training for a half marathon.
As I got older, I realized that I couldn't handle carbs quite like that anymore.
I kind of like Dr. Mark Hyman's "Paleo-Vegan" suggestion, or Jules from Stonesoup's version of paleo (she eats beans and cheese).
For weight control, I need to limit carbs. But they can't be zero or I get a brain fog.
For the planet and health, I do worry about the amount of meat that is eaten in a paleo diet.
I'm still experimenting.
November 2014, I gave up wheat, sugar, alcohol for a month and dropped 7 lbs, caloric intake not changing (the 3 prior months was 2 lbs a month).
November 2015, I decided to do it again. I lost 6 lbs before the whole family got the stomach flu.
However, in November 2015 I was experimenting with a beachbody program the "Ultimate Reset", which starts healthy and ends vegan by the end of the first week. It's 21 days.
I found that it also worked for me - especially when I had PMS and was craving carbs. Permission to have oatmeal for breakfast and beans and rice for dinner? Yes please.
Still trying to find that right balance of what will work for me long term. I'm not interested in giving up any one food group.