21-Day Keto Challenge

The ketogenic diet has been around for decades, but it’s become one of the most talked-about approaches to fat loss and energy. At Dexter Tenison Fitness, we’ve seen clients get real results with keto when they follow it correctly.

Here’s your 21-day game plan.

What Is Keto?

Keto is a high-fat, moderate-protein, very low-carb diet. By drastically reducing carbohydrates (typically under 30-50 grams per day), your body switches from burning glucose to burning fat for fuel. This metabolic state is called ketosis.

Week 1: The Transition

The first week is the hardest. Your body is adjusting to a new fuel source. Expect some fatigue, brain fog, and cravings — this is sometimes called the “keto flu.”

Survival tips:

Drink extra water and add electrolytes (sodium, potassium, magnesium)
Don’t restrict calories too aggressively — focus on cutting carbs first
Eat plenty of healthy fats: avocado, olive oil, nuts, butter

Week 2: Finding Your Groove

By week two, most people start feeling better. Energy stabilizes, cravings decrease, and you’ll likely notice your clothes fitting differently.

Foods to build meals around:

Proteins: chicken thighs, salmon, ground beef, eggs
Fats: avocado, coconut oil, cheese, heavy cream
Vegetables: spinach, broccoli, cauliflower, zucchini, bell peppers

Foods to avoid:

Bread, pasta, rice, potatoes
Sugar in all forms (including fruit juice and most fruits)
Beer and sugary cocktails

Week 3: Momentum

By now you should be fat-adapted. Workouts may feel strong again, hunger is controlled, and mental clarity often improves. This is where the magic happens.

Tips From Dexter Tenison Fitness

Track your macros for the first two weeks. Apps like MyFitnessPal make this simple.
Don’t fear fat. On keto, fat is your primary fuel. Embrace it.
Keep training. Resistance training pairs perfectly with keto for body recomposition.
Plan your meals. Winging it on keto leads to falling off the wagon.

Is Keto Right for You?

Keto works well for many people, but it’s not the only path. At Dexter Tenison Fitness, we believe the best diet is one you can sustain. Give this 21-day challenge an honest effort and see how your body responds.