Well, I certainly applaud anyone wanting to cut down their sugar intake to below 100 grams after 5pm, but take it from this old gym rat, I've spent my entire adult life in the gym, and nutrition like this can do more harm than good.
If you only eat one type of carb (and that's all a eating a single complex carb is going to do for you), you're setting yourself up for different somatotypes down the road. I've seen it a hundred times.
It's like putting a powerful engine in a stock Toyota Tercel. What will you accomplish? You'll blow out the drive train, the clutch, the transmission, etc., because those factory parts aren't designed to handle the power of an engine much more powerful than the factory installed engine.
Complex carbs basically only fuel some of your thighroid gland and to some extent, your glycogen stores. What you really want to do is eat every type of carb, all the major carbohydrates (monosaccharides, oligosaccharides, and polysaccharides) at the same time, over the course of the day. And don't forget your sugars too!
I'm proud of you wanting to do this. Three cheers! Falling in love with exercise, eating right, etc., is one of the greatest things you can do for yourself. And you WILL fall in love with it if you can just force yourself to stick with it a year or two and experience the amazing progress you'll make.
But do it right, okay?