Train harder. Eat cleaner. Get leaner.
For many men, these sound like the basic rules of getting into shape. More training means more progress, fewer calories mean less body fat, and if you’re still performing reasonably well in the gym, everything must be working as it should.
But there comes a point where more stops being better.
When training demands increase while the body isn’t receiving enough energy to support them, the effects may eventually extend beyond gym performance. Over time, insufficient energy availability can influence recovery, hormonal function, libido, and other aspects of health (Mountjoy et al.).
This is where low energy availability (LEA) becomes relevant.
Energy availability describes how much dietary energy remains for the body’s normal physiological functions after accounting for the energy used during exercise (Melin et al.). When too little energy remains, the body has to adapt by adjusting how it allocates its resources.
And those adaptations aren’t always visible in the mirror.
Your Body Has Priorities Beyond Your Workout
Your body needs energy around the clock. It isn’t only using fuel to power your training sessions; it also needs energy to maintain organs, regulate temperature, repair tissues, support the immune system, maintain bone health, and regulate hormones.
When energy availability remains too low, the body may begin adjusting some of these processes in order to conserve resources (Areta et al.).
In men, research into prolonged low energy availability has identified changes involving the endocrine system, including reproductive hormones involved in testosterone regulation (McGuire et al.). This doesn’t mean that every man who trains hard or follows a calorie-restricted diet will experience low testosterone. Rather, it highlights that the effects of chronic under-fuelling can extend beyond changes in body composition or gym performance.
Looking lean and muscular, therefore, doesn’t necessarily mean that everything underneath is functioning optimally.
Libido Can Be a Signal
One change some men may notice when energy availability becomes too low is a reduction in sex drive.
Of course, libido is complex. Sleep, stress, relationships, medications, psychological health, and many other factors can affect it. Energy availability and hormonal function, however, can also be part of the picture. Research in male athletes has linked low energy availability with hormonal alterations, including changes involving testosterone (McGuire et al.; Łagowska et al.).
This becomes particularly relevant when several changes appear at the same time. If a previously healthy, active man becomes increasingly lean while also experiencing persistent fatigue, poorer recovery, and a noticeable reduction in libido, it may be worth looking beyond the training programme itself.
The problem might not be that he needs to work harder. He might need to recover and eat enough to support what he is already asking his body to do.
Testosterone Is Only Part of the Story
Testosterone tends to receive most of the attention when male hormones and fitness are discussed, but the body’s response to insufficient energy is broader than a single hormone.
Low energy availability can affect multiple physiological systems rather than producing one isolated hormonal change (Mountjoy et al.; Areta et al.). The bigger question is whether the body has sufficient resources to support both the training you’re doing and everything else it needs to do.
This is an important distinction because performance and health are not separate systems. The same body that needs to adapt to your training also needs to maintain basic physiological functions between workouts.
Recovery Requires Fuel
Recovery isn’t simply about taking a day off.
Repairing tissues, replenishing energy stores, and adapting to training all require nutritional resources. Protein is important, but recovery isn’t a protein-only process. The body also needs sufficient total energy, carbohydrates, fats, and micronutrients to support the many processes happening between one workout and the next.
It’s therefore possible to have an excellent training programme, hit your protein target every day, and still be under-fuelling your body overall.
And adding another workout doesn’t solve that problem. It increases the demand.
Sometimes Progress Means Doing Enough, Not More
Training should challenge the body. That challenge is what creates the stimulus for adaptation, but the equation only works when that stimulus is followed by adequate nutrition and recovery.
Training + Fuel + Recovery → Adaptation
When one side of that equation becomes chronically inadequate, pushing harder isn’t necessarily the answer. More training may simply increase the gap between what your body is being asked to do and the resources available to support it.
Sometimes the most productive adjustment isn’t another workout, another restriction, or another attempt to get leaner. It’s making sure the foundation underneath your training is strong enough to support it.
Where Nourishy Can Help: Your Energy & Fatigue Shield
Understanding the patterns behind how you eat, train, and recover can be an important starting point.
Inside Nourishy, Energy & Fatigue is one of the body-system shields designed to help you make sense of those patterns. Rather than looking at calories or individual nutrients in isolation, the shield brings together information from your energy intake, physical activity, macronutrients, and relevant micronutrients. It then evaluates how well your recent nutrition patterns are supporting the processes involved in energy production and everyday energy levels.
For example, it can highlight patterns such as high activity combined with relatively low energy intake, or consistently low intake of nutrients involved in normal energy metabolism, including iron, magnesium, and several B vitamins.
The result is a simple view of something that can otherwise be quite complex: is the way you are eating keeping up with what you are asking your body to do?
Because Nourishy tracks these patterns over time, the Energy & Fatigue shield isn’t just about one meal or one difficult workout. It can help you notice when your nutrition and activity habits are repeatedly moving in a direction that may deserve more attention.
It’s important to be clear about what this means. Nourishy doesn’t diagnose low energy availability or explain why you feel tired. Instead, it provides another way to connect the dots between what you eat, how much you move, and how your nutritional patterns may be supporting your body’s energy needs.
Because sometimes the answer to better performance isn’t another workout.
It’s making sure your body has enough to work with.
Works Cited
Areta, João L., Helen L. Taylor, and Katja Koehler. “Low Energy Availability: History, Definition and Evidence of Its Endocrine, Metabolic and Physiological Effects in Prospective Studies in Females and Males.” European Journal of Applied Physiology, vol. 121, 2021, pp. 1–21. https://doi.org/10.1007/s00421-020-04516-0.
Łagowska, Katarzyna, et al. “Hungry Runners – Low Energy Availability in Male Endurance Athletes and Its Impact on Performance and Testosterone: Mini-Review.” European Journal of Translational Myology, 2023.
McGuire, A., G. Warrington, and L. Doyle. “Low Energy Availability in Male Athletes: A Systematic Review of Incidence, Associations, and Effects.” Translational Sports Medicine, vol. 3, 2020, pp. 173–187. https://doi.org/10.1002/tsm2.140.
Melin, Anna K., Ida A. Heikura, Anne Tenforde, and Margo Mountjoy. “Energy Availability in Athletics: Health, Performance, and Physique.” International Journal of Sport Nutrition and Exercise Metabolism, vol. 29, no. 2, 2019, pp. 152–164. https://doi.org/10.1123/ijsnem.2018-0201.
Mountjoy, Margo, et al. “2023 International Olympic Committee’s (IOC) Consensus Statement on Relative Energy Deficiency in Sport (REDs).” British Journal of Sports Medicine, vol. 57, no. 17, 2023, pp. 1073–1097. https://doi.org/10.1136/bjsports-2023-106994.