> If a person takes sufficient amount of leafy greens + vegetables + egg/meat + plant based protein (like lentil , beans) , will he go through any side effects ?
As long as you get enough to satisfy your body’s needs and don’t have allergies to any of the foods you eat, no, no negative side effects.
> From the internet and reddit I’ve come to learn that , if you cut off carbohydrate foods completely , body’s muscle turn to fat . Thus one’s muscles decrease in weight and amount , making one weak.
Lol. Link please
> Also in Quora I found various articles/writings that were saying one could replace Carbohydrate with Protein based foods (meat,lentil,legume,beans).
Legumes also have a fair amount of carbs. Although they’re complex carbs which aren’t bad as long as you don’t overdo them.
Also, look up keto diet for an example of carb-less diets.
> So, is it about taking enough calory as food (even if it’s protein based) to not let body turn muscle into energy ?
> The quora posts discussed that even protein based foods (meat,egg) contains calory/energy > So no need to eat rice/wheat based food.
Yes, all foods contain calories/energy. How much you need depends on your body and lifestyle. A better goal to focus on is to meet your daily intake of macronutrients. Look up macros calculator for a better idea of what you need.