High caffeine has its side effects though so be ready for nausea, sleeplessness stomach ache, tiredness, tender breasts, faster heart beats, feeling nervous, etc. I came across this as a coincidence but I got bigger breasts, and my buttocks are growing as well as my hips and thighs, but...
If you're always feeling "foggy", reliant on caffeine, and have constant low energy, you might have some imbalances going on. Could it be ahormone imbalance? Thyroid, estrogen, progesterone, testosterone, insulin, and cortisol to name a few. ...