Evidence-based medicine: what it means

Evidence-based medicine is the practice of making clinical decisions using the best available scientific research, the physician's experience, and each patient's values. In practice, this means that a treatment is recommended because studies have shown it works and is safe — not because it is fashionable or because someone claims it worked for them.

This way of working transformed modern medicine. For decades, many decisions were based on custom or on the authority of whoever proposed them. Today, when you visit a rigorous clinic, you expect what is offered to you to be backed by verifiable data.

What evidence-based medicine is and why it matters

The term was popularised in 1996 by an article written by physician David Sackett and his colleagues in the British Medical Journal. They defined it as the conscientious, explicit, and judicious use of the best available evidence to make decisions about the care of each patient. The idea is straightforward: health decisions must be grounded in solid proof, not in intuition.

Evidence-based medicine rests on three pillars that work together:

• Scientific research, that is, the clinical trials and reviews that measure whether a treatment genuinely helps.
• The physician's clinical experience, which interprets that data and applies it to the specific situation of the person in front of them.
• The patient's values and preferences, because the best option also depends on what that person wants and is prepared to accept.

It matters because it protects your health and your money. A treatment without evidence may be useless, expensive, or even harmful. When a decision is grounded in evidence, you know that someone has already verified, in a systematic way, that the benefits outweigh the risks.

How to tell proven treatments from passing trends

Not all evidence carries the same weight. Medicine organises evidence into a kind of hierarchy. At the base sit expert opinions and individual testimonials, which represent the weakest data. Above them come observational studies. At the top sit controlled clinical trials and systematic reviews, which summarise many studies at once.

One piece of data helps explain why this caution is necessary. A systematic review of interventions assessed in Cochrane reviews, published in 2022, found that only around 5.6 per cent had high-quality evidence supporting a clear benefit, according to the data recorded in PubMed. Most treatments studied rigorously do not reach that level of proof, so it is wise to be sceptical of anyone who promises absolute certainty.

To separate what is proven from what is merely passing, look out for a few signs:

• A trend usually relies on anecdotes, celebrities or "miraculous" results. A proven treatment relies on studies that have been published and reviewed by other professionals.
• A trend promises quick results with no downsides. Serious medicine explains benefits, limitations and possible adverse effects.
• What is proven can be replicated and measured. What is fleeting tends to depend on a single supplier or an exclusive product.

The role of science in aesthetics and longevity

Aesthetics and longevity are two fields where unsupported promises abound. That is precisely why evidence is so valuable here. An aesthetic treatment may be very popular on social media and yet lack studies demonstrating that it does what it claims.

Applying scientific criteria gives these treatments a solid foundation. Procedures such as botulinum toxin, certain lasers and some peels have decades of studies on their safety and results. Other novel products or protocols do not yet. What makes the difference is the quality of the evidence, not the enthusiasm of the advertisement.

The same is true in longevity. The market is full of supplements and protocols that promise to extend life. It is worth looking at what the research says before spending money on them — a topic we address in our guide on longevity supplements and what science says. There are also scientifically grounded tools for measuring the real impact of a habit or a treatment, as explained in the article on biological age and how to measure it.

At Clínica Valorian, the team led by Dr. Florian A. Vallecillo Cabrera works from this principle: every skin, aesthetic or longevity treatment is chosen on the basis of what the studies demonstrate, then tailored to each person's goals.

How it protects patients from unsupported promises

Health misinformation is more common than it might seem. Recent large-scale international surveys show that a broad majority of the population believes at least one health claim that has already been debunked. The problem cuts across all educational levels: having a university education barely reduces the likelihood of holding a false belief.

That environment is fertile ground for unsupported promises. Evidence-based medicine acts as a filter. If a procedure lacks studies to support it, a rigorous professional will say so clearly rather than selling it anyway. This protects the patient in three ways:

• Avoids unnecessary expenditure on treatments with no demonstrated benefit.
• Reduces risks, by ruling out interventions whose safety has not been established.
• Sets realistic expectations, so that you know what to expect before you begin.

What to ask your doctor to ensure a rigorous approach

You do not need to be an expert to check whether a recommendation has a solid basis. It is enough to ask the right questions and observe how the professional responds. Here are four useful ones:

1. What studies support this treatment? A rigorous answer cites research, not just the doctor's personal experience.
2. What results can I realistically expect? Be wary of absolute guarantees and claims that it "always works".
3. What risks or side effects does it carry? Every real treatment has its limits; anyone who does not mention them is withholding part of the information.
4. Are there alternatives? An honest approach compares options rather than always steering you toward the same one.

A good professional welcomes these questions and answers with data and nuance. Acknowledging what is not yet known is also a sign of rigour, not weakness.

The next time you are considering a treatment — whether health-related, aesthetic, or longevity-focused — ask in writing what evidence supports it and what results are realistic for your specific case. If you would like to start on a solid foundation, schedule a medical assessment at Clínica Valorian, where every recommendation is grounded in what science supports and tailored to your goals.