Well, it's multifaceted. When I first started this I believed in the big bad insulin faeries. Now, I pretty much believe in the exact opposite. In fact, the higher GI the food, the better I typically feel on it. I spent about 4 months scared of fruit and potatoes.
Originally Posted by YogaBare
My avoidance of grains and legumes initially had me feeling great. My skin cleared up, I had more energy, I wasn't as hungry, etc. But it suffered from the law of diminishing returns...and eventually started going backwards. My lifts started going backwards, I got the chills after I ate, I had a very low heart rate at night (my pulse before bed was 43 and in the 50's during the day), I got gassy if I had dairy and I wasn't really losing any body fat...just stalling or losing muscle.
Since dropping fatty meats for the most part (I've never really been a big fan) and eating leaner meats, trying to find more gelatinous cuts, eating a lot more eggs and a whole hell of a lot more fruit and starch, my lifts went through the roof, I don't have chills anymore after I eat, I've leaned out quite a bit, have a ton more energy, way stronger libido...it's a night and day difference. Research has pointed me that it's largely due to not enough carbohydrate to balance out all the protein I was eating from all the meat. Too much protein in the absence of carbohydrate promotes an overabundance of glucagon, and it also promotes gluconeogenesis. People act like gluconeogenesis is a good thing around here. It is you essentially forcing your body to break down muscle tissue to make glucose for your brain. It is very stressful and mimics starvation stress. Your body wants to function on its primary metabolic pathway, not be forced to tap into "reserves" and use a secondary metabolic process. In small doses, carbohydrate restriction and slipping into gluconeogenesis/ketosis can be very beneficial, but when it's a typical occurrence your body starts breaking down - which is why people feel great initially, then start feeling like shit 3-6 months in.
Embrace all food. Eat some meat, vegetables, fruit and starch every day if you can. Just pick healthy, unprocessed, nutrient-dense, whole food sources. You'll drop the weight as long as your calories are under control, and you'll do it without generating tons of stress hormones.
Don't put your trust in anyone on this forum, including me. You are the key to your own success.