Either way, before I knew what was going on, I got frustrated at my textbook healthiness yielding no answers, went off the low-carb deep and and cut out grains and sugars almost entirely from my diet.
Because my insulin/glucose levels have now moved from the penthouse to a basement apartment, I no longer have dramatic swings in energy throughout the day. My energy at 7AM is roughly the same energy I have by half after 4. I don't need caffeine or sugar to push me though a tired spell, and I haven't felt a caffeine/insulin crash in months.
Caffeine control is one thing but insulin is the body's top dog energy regulator. If you have energy issues, start by focusing on insulin, not caffeine.