"Even enough protein might not be enough when you're trying to lose weight!"

Protein is one of the most important nutrients for anyone who does strength training. It helps maintain and build muscle mass, which is especially important during a weight-loss diet. However, it is precisely during weight loss that a relatively common problem can arise.

Athletes carefully monitor their protein intake but at the same time significantly restrict their total calorie intake. And that’s exactly what seven-time Mr. Olympia winner Arnold Schwarzenegger has now warned against. In the November 4 issue of his newsletter, Arnold’s Pump Club, he highlighted an experiment showing that sufficient protein alone may not be enough to maintain intense athletic performance.

Researchers compared three diets. The results were surprising!

In the study, active adults sequentially followed three different dietary regimens. Each lasted five days. The first diet provided sufficient energy. The other two were based on very significant calorie restriction. However, they differed in how individual macronutrients were restricted.

In one case, participants maintained their protein intake and significantly reduced their intake of carbohydrates and fats. In the second case, they reduced their intake of protein, carbohydrates, and fats in equal proportions. The researchers then monitored their performance during 30-second sprints on a stationary bike.

And they discovered an interesting difference.

When participants maintained a high protein intake at the expense of other nutrients, they were unable to sustain the same performance during the sprint as they did with adequate energy intake.

Conversely, with a more balanced restriction of macronutrients, no clear decline in sprint performance was observed compared to the diet with sufficient energy intake. The results thus suggest that with an extreme diet, it may matter not only how many calories are consumed but also how they are distributed among the various macronutrients.

Why Are Carbohydrates Important During Intense Training?

Carbohydrates are an important source of energy, especially during intense physical activity. The body stores them in the form of glycogen in the muscles and liver. During strenuous training, muscle glycogen can significantly contribute to the energy supply of working muscles.

If an athlete consumes too few calories over a long period while also significantly restricting carbohydrates, this can, in some situations, negatively affect their ability to perform repeated intense efforts. However, this does not mean that every low-carbohydrate diet automatically reduces performance.

The outcome depends on the specific activity, the duration of the diet, and the individual’s level of fitness. Furthermore, the experiment in question lasted only a few days, and the researchers did not directly measure muscle glycogen stores. Therefore, it cannot be concluded from this study that a decrease in muscle glycogen was the sole cause of the observed difference.

Arnold recommends a simpler approach to weight loss

Schwarzenegger therefore recommends starting with a more moderate calorie deficit. This makes it easier for athletes to ensure they get enough protein while still leaving room in their diet for carbohydrates and fats. This approach may be more sustainable in the long term than extreme calorie restriction.

It also allows for gradual adjustments to the diet in case weight loss stalls.

After all, the goal shouldn’t be just to lose weight as quickly as possible, but also to maintain enough energy for quality training and daily life.

Don’t forget about carbohydrates and protein during intense workouts

If you regularly do strength training while trying to lose fat, it’s important to ensure you’re getting enough protein and total energy. While protein contributes to building and maintaining muscle mass, it cannot, on its own, replace carbohydrates or other nutrients needed during intense physical activity.

GymSupps XWhey Protein is a practical option for supplementing protein. For longer and more intense workouts, you might also consider GymSupps Super Intra, which contains carbohydrates in the form of Cluster Dextrin® and other ingredients designed for use during physical activity.

However, dietary supplements cannot compensate for a long-term, poorly balanced diet. Arnold’s warning therefore highlights an important point.

If you want to lose weight while maintaining high athletic performance, it’s not enough to focus solely on protein intake. It’s also important to consider how much energy you’re actually providing your body.