16
Jul
2026
16
Jul
2026
What your patients look like on the outside starts with what’s happening on the inside. Dr Muninder Walia shares the case for test-based nutrition in the medical aesthetics and GP consultation
We spend considerable time in this profession discussing skin quality. We talk about laxity, hydration, the integrity of the dermal matrix, the speed at which tissues heal after treatment. We invest in devices, techniques, and product ranges. And yet, relatively few of us are asking the question that sits underneath all of it: what is the nutritional environment in which this patient’s cells are fundamentally operating?
I want to make the case that this question is not peripheral to our clinical work. It is central to it.
The gap between appearance and status
One of the most reliable observations from general practice, is that patients who present without obvious symptoms are not necessarily patients in good nutritional health. Subclinical deficiencies are, by definition, invisible until they are not. Vitamin D insufficiency rarely announces itself until bone health is already compromised. Magnesium depletion tends to manifest as fatigue, poor sleep, and reduced stress tolerance before anyone reaches for a blood test. And omega-3 deficiency-arguably the most clinically consequential nutritional gap in the Western adult population-does not come with a warning flag until the downstream consequences of chronic low-grade inflammation are already well established.
We know from the UK National Diet and Nutrition Survey (NDNS), published in June 2025, covering data from 2019 to 2023, that significant proportions of British adults are not meeting recommended intakes for a range of essential micronutrients. The gaps are not theoretical. They are documented, persistent, and disproportionately affect women, the demographic that makes up the majority of our patients.
As clinicians, we have a responsibility to do more than treat the surface.
Why omega balance matters in an aesthetics context
Omega-3 and omega-6 fatty acids are both essential; the body cannot synthesise them. What has changed profoundly over the past century is the ratio between them in the modern diet.
The evolutionary human diet maintained an omega-6 to omega-3 ratio of approximately 1:1 to 4:1. The modern Western diet now sits somewhere between 15:1 and 20:1, driven by the dominance of seed oils, processed foods, and reduced oily fish consumption. This imbalance matters clinically because the metabolic pathways of omega-6 and omega-3 are competitive. When omega-6 dominates, the eicosanoid cascade tilts towards pro-inflammatory mediators-prostaglandins, thromboxanes, and leukotrienes that promote vasoconstriction, platelet aggregation, and tissue inflammation.
For our patients, this translates into an internal environment that is chronically more inflamed than it needs to be. The consequences for skin are not trivial. Collagen degradation is accelerated by inflammatory matrix metalloproteinases (MMPs). Wound healing and tissue remodelling processes we actively stimulate with injectables, energy-based devices, and skin resurfacing are less efficient in an inflammatory state. Patients with elevated omega-6 dominance may not achieve the skin quality or treatment outcomes we would expect based on their age and lifestyle alone.
This is not speculative. A 2021 meta-analysis published in EClinicalMedicine (The Lancet’s open access journal), reviewing 38 randomised controlled trials involving over 149,000 participants, found that omega-3 supplementation was associated with statistically significant reductions in cardiovascular mortality, non-fatal myocardial infarction, and major adverse cardiovascular events. The cardiovascular and inflammatory pathways are the same ones affecting skin, connective tissue, and systemic ageing. If we take that evidence seriously in one context, we should take it seriously in ours.
The problem with assuming
The challenge has always been that nutritional advice without measurement is, at best, educated guesswork. We would not adjust a patient’s antihypertensive without checking their blood pressure. We would not modify a diabetic’s insulin regimen without HbA1c data. And yet, most nutritional interventions in clinical and wellness settings are made without any objective assessment of the patient’s baseline status.
A study published in Lipids in Health and Disease in August 2025, drawing on a database of over 590,000 dried blood spot (DBS) samples from individuals across multiple countries, including many who were already taking omega-3 supplements, found that the majority of participants had insufficient omega-3 levels. Even those who believed they were supplementing adequately frequently failed to achieve a balanced omega-6:3 ratio. The implication is direct: without a test, you do not know whether a supplement is working.
The dried blood spot methodology used in this research-a finger-prick capillary sample collected at home and analysed by an independent, GMP-certified laboratory-has been validated as a reliable and reproducible measure of fatty acid status. It is not a consumer wellness gadget. It is a CE-marked in vitro diagnostic tool. The distinction matters when we are recommending it to patients in a clinical context
What test-based nutrition looks like in practice
The integration of nutritional testing into clinical practice does not require a major operational overhaul. What it does require is a shift in how we frame the consultation.
I have found it useful to think of the nutritional assessment as sitting alongside the skin health assessment rather than separately from it. When I am evaluating a patient’s skin quality, I am already building a picture of their systemic health. Adding an objective fatty acid profile and, where appropriate, a vitamin D level, gives me a clinically grounded starting point for nutritional discussion that moves well beyond the usual generic advice about oily fish and sunlight.
For patients presenting with persistent skin dullness, poor healing after procedures, recurring redness, or accelerated photoageing relative to their chronological age, a nutritional test often reveals an explanatory picture. Many present with omega-6:3 ratios significantly above the 3:1 to 5:1 range at which most of the clinical evidence is based for inflammatory suppression. Bringing that ratio down through targeted supplementation, not assumption, can take three to four months but produces measurable changes in both the test result and, in my experience, patient-reported skin texture and resilience.
The SACN recommendation for vitamin D sits at 10 micrograms (400 IU) daily throughout the year for all UK adults. NICE guidance (PH56) identifies a fifth of UK adults as having low vitamin D status. In patients with darker skin tones, indoor occupations, or limited time outdoors, that proportion is considerably higher. Testing removes the guesswork and gives patients a concrete reason to supplement consistently, something that generic advice rarely achieves.
A word on collagen
The presentation landscape in medical aesthetics currently includes a great deal of enthusiasm for collagen supplementation, and it is worth being precise about what the evidence supports. A 2023 meta-analysis of 26 randomised controlled trials involving over 1,700 patients (Nutrients, MDPI) found that hydrolysed collagen supplementation produced statistically significant improvements in skin hydration and elasticity. However, a 2025 systematic review in the American Journal of Medicine, which stratified results by funding source and study quality, found that the effects in high-quality, independently funded trials were considerably more modest.
The honest clinical position is that hydrolysed collagen, particularly marine-derived, given the smaller peptide size and potentially higher bioavailability, is a reasonable adjunct to skin-focused supplementation plans, particularly in patients over 35, where endogenous collagen synthesis is in measurable decline. It should, however, be presented as a supporting intervention rather than a transformative one, and the distinction between Type I (marine, skin-focused) and Types II and III (bovine, with broader musculoskeletal application) is worth explaining to patients who are already navigating a crowded supplement market.
The clinical argument, summarised
Nutritional testing in medical practice is not a departure from clinical medicine. It is, I would argue, a return to it. Our patients are ageing systemically, not just anatomically.
The interventions we deliver interact with biological processes-healing, remodelling, inflammation, cellular turnover-that are directly influenced by nutritional status. Treating the skin without considering its internal environment is, to use a familiar analogy, gardening without attending to the soil.
Test-based nutrition allows us to move from general recommendations to personalised, measurable interventions. It gives patients objective data about their own physiology, which consistently improves compliance. And it positions the aesthetic and GP setting as something more than a procedure room, as a place where the whole patient is considered, and where the clinical standard of care reflects that.
The tools exist. The evidence base is there. The question is simply whether we choose to use it.
For more information on adding test-based nutrition to your clinic, please visit:
https://www.consultingroom.com/industry/campaign/zinzino
References
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