A Texas A&M study examines how creatine supports lean tissue retention in adults over 45, emphasizing the importance of combining it with strength training.
On September 18, 2026, Texas A&M University reported new findings from a study published in the Journal of the International Society of Sports Nutrition. The trial examined whether creatine monohydrate could affect body composition and strength in healthy, sedentary adults aged 45 to 65. Researchers also tracked health markers and cognitive measures over the same period. The team specifically wanted to see how the supplement interacted with both exercise and non-exercise routines over a 12-week timeframe.
The trial aimed to address the common problem of preserving lean tissue during weight loss, a challenge many adults face as their metabolism shifts. By observing 73 initial participants, the research team gathered data on how midlife bodies respond to supplementation during a transition to healthier habits. Texas A&M principal investigator Richard Kreider stated that the results may be relevant to maintaining muscle as people age. This perspective extends the potential relevance of creatine beyond competitive athletes to everyday adults seeking sustainable physical resilience.
To appreciate these findings, it helps to understand what this compound actually does in human biology. Texas A&M characterized creatine as a naturally occurring compound involved in replenishing cellular energy. We typically obtain it through foods such as meat and fish, but supplementation provides a more concentrated and reliable daily dose. This extra supply helps cells maintain energy output during physical exertion, which supports muscle mass and metabolic health as we age.
This biological support is especially crucial when adults attempt to improve their body composition through a calorie deficit. Energy restriction can lead to unintended muscle loss if daily nutrition and movement habits are not carefully managed. Preserving that lean, functional tissue is a central goal of responsible weight management. By supporting cellular energy levels, creatine may help middle-aged and older adults maintain their strength during these critical metabolic shifts.
In our experience at WeightRestart, this biological tension is incredibly common. Our leadership often reflects on the negative impact of traditional diet culture.
"One of the most common mistakes I see in adults over forty is focusing solely on the scale. People would celebrate rapid weight loss, only to find their energy plummeted and their metabolism slowed. They were losing muscle instead of just fat. Shifting the conversation from generic weight loss to body composition and strength training has been one of the most impactful changes we have championed."
A realistic body-composition strategy pairs a moderate calorie deficit with progressive resistance training, regular aerobic activity, and adequate protein intake. The university positioned the study exactly within this broader problem of preserving lean tissue during weight loss. They did not present creatine as a substitute for exercise or dietary change. Instead, they framed it as a supportive tool that works alongside physical activity to protect the body's functional tissue.
Mainstream coverage often frames this study around the idea of gaining muscle without any physical effort. While the results are interesting, they require careful interpretation rather than broad assumptions. The trial measured DXA-derived lean tissue, which can include water and other non-muscle components. This means the recorded gains are not identical to purely contractile muscle tissue, highlighting why adults must look beyond the scale when tracking body composition.
The headline finding should not be interpreted as proof that creatine builds functional muscle in every sedentary adult who takes it. The study was conducted over only 12 weeks, which is a relatively short window to assess long-term physiological changes. True body recomposition requires consistent effort over many months or even years. Treating any single supplement as a universal solution ignores the complex reality of human metabolism.
Furthermore, the study did not use a conventional four-group randomized design for exercise participation. Participants first chose whether to enter the exercise program or remain in the non-exercise condition. They were only randomized to receive either creatine or a placebo after making that initial choice. Because exercise participation was self-selected, the groups might have differed in motivation or health behaviors before the intervention began.
It is also important to note what the supplement did not accomplish. Creatine did not produce a statistically significant improvement in aerobic capacity. This suggests that the observed benefits were more apparent for muscular strength, lean tissue, and endurance than for cardiorespiratory fitness. Relying on a supplement as a replacement for movement, dietary quality, or targeted training habits is never a sustainable strategy.
The study analyzed 64 people who completed the 12-week intervention out of the 73 who originally began. The final sample included 40 women and 24 men, with an average age of 54.5 years. Participants took either 10 grams of creatine monohydrate daily, split into two 5-gram servings, or a maltodextrin placebo. To provide broader safety context, Texas A&M reported that a 2025 analysis by Kreider and colleagues reviewed 685 clinical trials and found no significant difference in the rate of reported side effects between creatine and placebo participants.
Within this specific 12-week trial, the researchers described the supplementation intervention as well tolerated, with infrequent and generally minimal side effects. Notably, no participant withdrew because of supplement-related problems. Among participants who did not join the structured exercise and diet program, the creatine group saw notable changes. These adults gained approximately 1.1 kilograms, or 2.4 pounds, of DXA-measured lean tissue over 12 weeks.
The non-exercise creatine group also improved leg-press and bench-press strength measures, as well as muscular endurance, compared with the non-exercise placebo group. The study found greater creatine-associated improvements in leg-press and bench-press one-repetition maximums overall. However, the most favorable body-composition results occurred when participants combined the supplement with intentional activity. The active program assigned a daily energy deficit of approximately 300 to 500 calories.
The diet target was set at 55 percent carbohydrate, 15 percent protein, and 30 percent fat. The exercise component consisted of supervised resistance and aerobic training three times per week. Resistance exercises were performed for three sets of 10 repetitions, followed by approximately 20 minutes of aerobic activity per session. The exercise-plus-creatine group gained approximately 1.27 kilograms of lean tissue over 12 weeks, while the exercise-plus-placebo group gained approximately 0.14 kilograms.
Additionally, the exercise-plus-creatine group reduced their body-fat percentage by approximately 3.24 percentage points, compared with approximately 1.87 percentage points in the exercise-plus-placebo group. The exercise-plus-creatine group also improved their time to exhaustion, reinforcing the value of creatine and strength training for adults after 45.
While these outcomes are encouraging, several variables require further investigation before this approach becomes standard clinical practice. The study reported changes in selected blood-lipid measures and HbA1c, but the researchers cautioned that these individual biomarker findings require confirmation. The same caution applies to the cognitive outcomes, which were also classified as exploratory rather than conclusive. Furthermore, the diet intervention provided a relatively low protein intake of approximately 0.94 grams per kilogram of body weight per day.
Because this daily protein target is somewhat modest, future studies must clarify how higher protein consumption might influence these body-composition changes over longer periods. Many modern nutrition strategies emphasize significantly higher protein intake to prevent muscle loss during periods of energy restriction. Understanding how an optimal protein diet interacts with creatine supplementation could yield even better results for midlife adults. Until then, these preliminary findings provide a helpful starting point for sustainable fitness programming.
Safety monitoring also remains an important consideration for future research. In this study, creatinine increased in the creatine groups, though reported values remained within the stated normal clinical ranges. The researchers noted that creatinine-based estimated glomerular filtration rate can be affected by creatine intake and increased muscle mass. Because the study did not measure cystatin C or directly measured filtration rates, anyone with kidney disease or complex medical conditions should consult a healthcare professional before supplementing.
Transparency in funding and potential conflicts of interest is also critical for evaluating future trials. The study was funded by the WoodNext Foundation through the Texas A&M Foundation, while Alzchem supplied the creatine and funded homocysteine assays. The study’s principal investigator, Richard Kreider, disclosed industry-related relationships, including advisory-board service for AlzChem, a creatine manufacturer. However, the article states that sponsors were not involved in data collection, analysis, or interpretation.
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