Your Clients Struggling? Return to the Nutrition Fundamentals
When a client hits a plateau, feels drained during workouts, or can’t seem to bounce back after intense sessions, the immediate reaction is often to tweak the training plan. But more often than not, the problem isn’t reps or sets, it’s fuel.
Specifically, a lack of quality carbohydrates.
As covered by Dr. Chris Moore, PhD, RD, in the NESTA-PFT course, carbohydrates play a direct and measurable role in performance, recovery, and mental clarity. They’re not just a “macronutrient”, they’re the body’s go-to energy source. And when they’re not being consumed in the right amounts, at the right times, or in the right forms, client results suffer.
This article is for fitness professionals who want a deeper understanding of how to coach smarter fueling strategies, starting with the basics.
Why Carbohydrates Still Matter
Let’s cut through the confusion. Carbohydrates have been unfairly blamed in mainstream diet culture, but in performance nutrition, they are non-negotiable. Carbs fuel both the muscles and the brain, making them essential for any activity that requires energy, endurance, focus, or recovery.
Carbohydrates are broken down into glucose, which is used immediately for energy or stored as glycogen in muscles and the liver. When a client trains hard, especially in sports or high-rep strength training, those glycogen stores are tapped to power movement. Without enough carbs in the system, fatigue sets in earlier, focus fades, and performance drops off.
Dr. Moore calls carbohydrates the “power nutrient” for a reason: they drive both physical and mental function in active individuals.
Quality Over Quantity
The quality of carbohydrate intake is just as important as the quantity.
It’s not just about “eating carbs”, it’s about eating the right kinds of carbs. That means prioritizing complex carbohydrates like whole grains, fruits, vegetables, and legumes. These foods offer more than just energy, they’re packed with fiber, vitamins, and minerals that support long-term health and satiety.
Compare that to simple sugars like soda or candy. While they technically count as carbs, they spike blood sugar and provide almost no nutritional value. They also create a cycle of energy crashes and cravings that can derail both training sessions and recovery.
Help your clients understand that not all carbs are created equal. Choosing nutrient-dense options helps keep energy steady and recovery on track.
Timing Makes a Difference
Nutrient timing is often overlooked, but it plays a critical role in how the body uses carbohydrates.
Before training, carbohydrates act as fuel. A balanced intake 1–2 hours before a session can improve performance and delay fatigue. For early-morning clients who don’t eat a full meal, even a small amount of easily digestible carbs, like fruit or toast—can make a difference.
After training, carbohydrates help replenish glycogen stores and kick-start recovery. This is especially important for clients training multiple times per day or involved in long, intense workouts. Pairing carbs with protein in the post-workout window can also enhance muscle repair and adaptation.
It’s not about strict timing down to the minute, but understanding and applying general principles can significantly improve outcomes.
Carbohydrate Needs Vary
There’s no one-size-fits-all approach to carbohydrate intake. The ideal amount depends on the type of activity, duration, intensity, and the client’s body size.
Dr. Moore notes that endurance athletes may need 6–10 grams of carbohydrates per kilogram of body weight per day. A marathon runner, for example, burns through energy at a much faster rate than a client doing a moderate bootcamp session twice a week.
That said, even general population clients benefit from structured carbohydrate intake. If someone feels sluggish halfway through a workout or struggles to recover, reassess their daily carb habits, not just their sleep or stress levels.
Hydration + Carbs = Performance Support
For workouts lasting longer than 60 minutes, hydration becomes just as important as energy availability. Here, carbohydrates and fluids work together.
Sports drinks with a mix of simple carbohydrates and electrolytes can help maintain hydration and supply quick fuel during prolonged activity. This is especially useful for endurance athletes, outdoor bootcamps, or back-to-back training sessions.
Keep in mind: not all clients need sports drinks. But for those who do, helping them understand when and how to use them adds a layer of performance support they’ll feel immediately.
Digestive Timing and Individualization
Every client digests and tolerates foods differently. What works well for one person pre-workout might leave another feeling sluggish or bloated.
That’s why understanding individual response is key. Encourage clients to experiment with timing and food types. Some may perform best with a small carb snack 30 minutes before a session; others may need a more substantial meal two hours out.
This kind of fine-tuning helps clients feel more in control of their nutrition, while giving them a performance edge rooted in real-world data, their own.
Fundamentals Aren’t Fancy—But They Work
The key message for fitness professionals is this: you don’t need the latest diet trend to help your clients perform better. You need the fundamentals.
Encouraging quality carbohydrate intake, timed effectively around training, based on real energy needs, that’s what drives results. These are the habits that make clients feel stronger, recover faster, and stay mentally sharp.
As Dr. Chris Moore explains in the NESTA-PFT course, the basics of carbohydrate nutrition are still the most powerful tool in your coaching toolkit.
Trends come and go. Fundamentals stick, and they get results.
Final Thoughts for Coaches
Whether your clients are training for an event, trying to lose weight, or simply looking to feel better day to day, their fueling strategy matters. Carbohydrates aren’t something to avoid or fear, they’re something to use wisely and with purpose.
As a certified fitness professional, your role includes cutting through confusion and teaching clients how to fuel for the work they’re doing. Start with what works. Stick with what’s proven. And always return to the fundamentals.
