Aspirin, Liver Fat, and Melatonin: What the Science Says This Week
Lab Notes: Week of May 18, 2026
Each week, Fit Body Science reviews the most important fitness and nutrition research — validating claims against the evidence and surfacing what actually matters. Here are this week's highlights.
Aspirin No Longer a Go-To for Heart Protection in Healthy Seniors
For decades, daily low-dose aspirin has been a staple in preventive medicine, often recommended to stave off heart attacks and strokes in older adults. But a high-scoring study now challenges that practice—especially for the healthy elderly. The research analyzed outcomes in community-dwelling adults aged 70 and older who took 100 mg of enteric-coated aspirin daily over a median of 4.7 years. The results? A non-significant reduction in major cardiovascular events, with only a slight dip from 8.8 to 7.8 events per 1,000 person-years.
More concerning, the study also highlighted an increased risk of bleeding, a known but serious side effect. While aspirin may still have a role in secondary prevention (for those with existing heart disease), this data strongly suggests it offers little benefit for primary prevention in otherwise healthy seniors.
This doesn’t mean aspirin is obsolete—but it does mean we should rethink blanket recommendations. Personalized risk assessment is now more important than ever.
Key takeaway for readers: If you're over 70, don’t start aspirin just because it’s common. Talk to your doctor about your individual risk profile.
See the evidence breakdown
Daily administration of 100 mg enteric-coated aspirin does not significantly reduce the rate of major adverse cardiovascular events, defined as fatal coronary heart disease, nonfatal myocardial infarction, or fatal or nonfatal ischemic stroke, in healthy community-dwelling adults aged 70 years and older. Over a median follow-up of 4.7 years, the event rate was 7.8 per 1000 person-years in the aspirin group versus 8.8 per 1000 person-years in the placebo group, yielding a hazard ratio of 0.89 (95% CI 0.77 to 1.03), confirming the absence of a statistically significant protective effect against ischemic cardiovascular events in this demographic.
Swap Bad Fats and Sugars, Slash Liver Fat—No Calorie Cutting Needed
You don’t have to eat less to improve your liver health—you just need to eat better. A compelling new study shows that simply replacing high-glycemic-index foods and those rich in saturated fat with lower-GI, lower-saturated-fat alternatives reduces hepatic fat in overweight adults—even when total calories and macronutrient ratios stay the same.
Participants followed an isocaloric, macronutrient-matched diet, but swapped items like white bread and butter for whole grains and healthier fats. After several months, MRI scans revealed significant reductions in liver fat. This suggests that diet quality, not just quantity, plays a direct role in metabolic health.
The implications are powerful: you can improve markers of fatty liver disease without hunger or restrictive dieting. Small, sustainable swaps—like choosing steel-cut oats over sugary cereals or avocado over cheese—may yield real physiological benefits.
This study reinforces what nutrition science is increasingly showing: not all calories are created equal.
Read the full study review
Replacing Foods with a High-Glycemic Index and High in Saturated Fat by Alternatives with a Low Glycemic Index and Low Saturated Fat Reduces Hepatic Fat, Even in Isocaloric and Macronutrient Matched Conditions
Melatonin’s Surprising Role in Heart Failure Management
Best known for regulating sleep, melatonin may have a new role: supporting heart health in patients with stable heart failure. An exploratory trial found that 10 mg of melatonin taken nightly for 24 weeks significantly improved a composite clinical score in patients with reduced ejection fraction.
While it didn’t reduce mortality, the supplement led to fewer heart failure exacerbations and meaningful improvements in quality of life. Researchers believe melatonin’s antioxidant and anti-inflammatory properties may help protect cardiac tissue and stabilize cellular function.
This isn’t a cure, but it’s a promising adjunct therapy. The benefits appear to stem from broader physiological modulation rather than a single mechanism.
For patients struggling with fatigue and frequent flare-ups, melatonin could offer a safe, accessible way to improve daily functioning—though larger trials are needed to confirm these findings.
See the evidence breakdown
Twenty-four weeks of 10 mg nightly melatonin supplementation significantly improves a composite clinical outcome score in stable heart failure with reduced ejection fraction patients, driven primarily by reductions in heart failure exacerbations and quality of life improvements rather than mortality changes, reflecting broader clinical benefits beyond biomarker modulation.
Creatine Safety Confirmed: 685 Trials Show Minimal Side Effects
Creatine is one of the most researched supplements in sports science—and for good reason. A comprehensive analysis of 685 clinical trials has reaffirmed its safety profile, finding that reported side effects are rare and typically mild.
Common concerns like kidney damage, dehydration, or muscle cramping were not supported by the data. In fact, the frequency of adverse events was similar between creatine and placebo groups across studies.
This massive body of evidence strengthens the case for creatine as a safe, effective supplement for improving strength, power, and muscle mass—especially when combined with resistance training.
Whether you're an athlete or an older adult looking to preserve muscle, creatine supplementation appears to be a low-risk, high-reward strategy.
Read the full study review
Safety of creatine supplementation: analysis of the frequency of reported side effects in clinical trials
Overhead Press: Still Worth It for Shoulder and Upper Body Growth?
The overhead press is a staple in strength training—but does it really deliver optimal muscle growth? A new video analysis weighs the pros and cons, scoring 29.0 for its benefits versus 17.0 against potential drawbacks.
Proponents argue it’s unmatched for building deltoids, triceps, and upper trapezius, while also engaging core stability. It’s a functional movement that mimics real-world lifting patterns and supports athletic performance.
Critics point to shoulder joint stress, especially for those with pre-existing mobility issues or impingement history. But with proper form and progressive loading, the risk appears manageable for most.
The verdict? The overhead press remains a valuable tool for upper body development—just tailor it to your anatomy and goals.
Watch the full analysis
Should You Overhead Press for Muscle Growth?
This week’s findings highlight a shift in how we think about health interventions—not just what we do, but who it’s for and how it’s applied. From questioning long-held assumptions about aspirin to affirming the power of food quality and the safety of popular supplements, the science points to personalization, precision, and practicality. Whether you're managing a chronic condition or optimizing performance, the best choices are those grounded in evidence and tailored to your body.
Sources & References
Overhead Press: Still Worth It for Shoulder and Upper Body Growth?
**The overhead press is effective for upper body muscle growth, with benefits outweighing risks for most lifters.**
Swap Bad Fats and Sugars, Slash Liver Fat—No Calorie Cutting Needed
**Improving diet quality by lowering glycemic index and saturated fat reduces liver fat, even without calorie restriction.**
Creatine Safety Confirmed: 685 Trials Show Minimal Side Effects
**Creatine supplementation is safe, with minimal side effects reported across hundreds of clinical trials.**
Aspirin No Longer a Go-To for Heart Protection in Healthy Seniors
**Daily low-dose aspirin does not significantly reduce major cardiovascular events in healthy adults over 70.**
Melatonin’s Surprising Role in Heart Failure Management
**Nightly melatonin supplementation improves clinical outcomes and quality of life in heart failure patients.**