Fruit?

You probably need a fattier diet for your nutrition needs, since the diet listed is a carbs-and-protein diet. Try having way more nut butters / olive oil / other healthy fats

sugar-crash-wise

I meant the same thing. Spices are more than just taste.

And I seldom put sugar in my lemonade.

The rice seems to do the job

I've started eating a fruit (usually apple) after breakfast, and sometimes as an afternoon snack, and that keeps my energy up, personally.

If this is a new regimen for you it might just be an adjustment period. But I'm not a nutritionist. Just some random bean fan.