If you need coffee to feel energetic: something's off in your diet and/or lifestyle. Low-carb is all fine, but if you are eating something that your body doesn't respond well to (with a low-level allergy response, for example), the coffee is merely going to add more stress to your body.
Also check your daily exposure to various hazardous chemicals: most brands of cosmetics, washing detergents, hand soaps, shaving creams, "body care" products in general, house cleaning agents, and so on, should be avoided like the plague. Avoid caffeine. Avoid alcohol. Avoid red meat.
Avoid any food products that are advertised on television. Avoid anything with GMO corn or Monsanto-related food stuffs. Avoid natural foods that are heavily sprayed, and opt for organic instead. Eat lots of greens and veggies, preferably raw, alongside your meals. 50% of your food intake minimum should be raw greens and veggies.
Exercise at least 30 minutes a day. Go for walks - at least 5 km a day. Drink filtered tap water (depending on where you live).
Avoid foods that make you tired. These can be hard to figure out, though. I myself cannot tolerate citrus fruits, for example. Many people cannot tolerate cow milk products. Yet figuring out which foods your body cannot tolerate very well is key to a high energy level and a happy lifestyle.
Pretty much all open doors, really. Everyone knows this, but most will not stick to a semi-healthy lifestyle. Yet people complain when they feel weak and low on energy, abusing coffee and energy drinks to caffeinate themselves to force their stressed out bodies to function.
Well I feel fine when I eat bread, fries, chips, Frosted Flakes, and all the foods I love.
Its only when I cut out carbs do I feel tired