Blog
News, research and guides
755 articles from the VitMode editorial team.
GuidesFasted Training and Muscle Loss: Myths and Facts
The fear that fasted strength training speeds up muscle breakdown, because the body “has nothing else to burn” besides muscle tissue, is one of the most persistent fitness myths — and, as the newest randomized clinical trial comparing 12 weeks of fasted versus fed training shows, an untrue one. That doesn't mean meal timing relative to training is completely irrelevant — only that total daily protein and energy intake is what decides the outcome, not the training time window itself.
VMRedakcja VitMode — Żywienie, suplementy i trening13 min
October 3, 2026
GuidesCold Plunge and Muscle Growth: Does Cold Blunt Hypertrophy?
Regular, full-body immersion in very cold water immediately after a strength workout can genuinely blunt long-term strength and muscle gains — that's the conclusion of a 12-week study that found smaller gains in the group using cold plunges after every session compared to active recovery. The mechanism lies in suppressing the anabolic signaling that drives muscle remodeling after exercise. That doesn't mean cold plunging is a bad choice overall — it means timing relative to strength training matters.
VMRedakcja VitMode — Hormony i endokrynologia13 min
October 3, 2026
GuidesBlood Flow Restriction (BFR) Training and Muscle Growth at Low Loads
Blood flow restriction (BFR) training involves partially, deliberately restricting blood flow in a limb with a pressure cuff while exercising at a very low load — usually 20-30% of your one-repetition maximum. It sounds like a contradiction: how can training with a light dumbbell build muscle comparably to classic heavy-load strength training? The answer lies in a specific metabolic environment created inside the muscle when venous outflow is restricted — and recent meta-analyses show the hypertrophic effect is real, and in many conditions close to that of heavy-load training.
VMRedakcja VitMode — Żywienie, suplementy i trening12 min
October 3, 2026
GuidesIntermittent Fasting and Women: Does IF Work Differently Than for Men?
Intermittent fasting (IF) is often presented as a universal weight-loss and metabolic-health method, equally effective regardless of sex. A growing body of research suggests otherwise: the hormonal axis regulating the menstrual cycle is evolutionarily far more sensitive to energy-deficit signals than the axis regulating testosterone. That doesn't mean intermittent fasting is off-limits for women — it means the protocol's form, intensity, and context (cycle phase, energy availability, stress level) matter more than they do for men.
VMRedakcja VitMode — Badania i biomarkery12 min
October 3, 2026
GuidesAlcohol and Insulin Resistance: How Regular Drinking Affects Insulin Sensitivity
“Alcohol is bad for metabolism” and “red wine improves insulin sensitivity” are two contradictory claims you'll find online — and both are partly true. Large epidemiological studies show a J- or U-shaped relationship: very moderate consumption is sometimes associated with slightly lower type 2 diabetes risk than total abstinence, but above a specific, well-documented threshold the risk rises clearly. This isn't a simple “alcohol is bad” or “alcohol helps” story — it's a story about dose, regularity, and a liver mechanism that ultimately determines the direction of the effect.
VMRedakcja VitMode — Badania i biomarkery12 min
October 3, 2026
GuidesSalt and Blood Pressure: Is Everyone Salt-Sensitive?
“Cut back on salt, it raises your blood pressure” is one of the most commonly repeated pieces of health advice — and also one of the more imprecise ones. Salt sensitivity is a real, well-documented but heterogeneous trait: in some people, blood pressure responds strongly to changes in sodium intake, while in others it barely responds at all. Long-term studies estimate that salt-sensitive people make up roughly a third of healthy individuals and more than half of people with hypertension — but not everyone, and not to the same degree.
VMRedakcja VitMode — Serce i układ krążenia12 min
October 3, 2026
GuidesCaffeine and Insulin Sensitivity: The Short-Term Effect on Blood Sugar
One of the more surprising paradoxes in nutrition science: regular coffee drinking is linked in population studies to lower type 2 diabetes risk, while a single dose of caffeine taken before a meal acutely raises post-meal blood glucose and lowers insulin sensitivity. Both observations are true — and they aren't contradictory once you understand the difference between caffeine's acute effect alone and the long-term, complex effect of coffee as a whole beverage.
VMRedakcja VitMode — Żywienie, suplementy i trening12 min
October 3, 2026
GuidesIntermittent Fasting and Thyroid Hormones: Does IF Lower T3?
Intermittent fasting (IF) is sometimes described as a method that «wrecks your metabolism» by lowering T3, the active thyroid hormone. The real picture is more nuanced: it isn't the eating window itself that lowers T3, but the depth and duration of the calorie deficit. A daily, moderate 16:8 window with adequate calorie intake affects the thyroid very differently than a multi-day fast or chronic, aggressive energy restriction.
VMRedakcja VitMode — Hormony i endokrynologia12 min
October 3, 2026
GuidesTRT Online — Can You Legally and Safely Start Testosterone Therapy Through Telemedicine?
A video consult, blood work ordered remotely, a prescription issued without ever setting foot in a clinic — that's what the increasingly popular telemedicine TRT pathway actually looks like. We explain what this really involves, how a legitimate telemedicine model differs from one that writes prescriptions without labs, and how to evaluate a provider yourself before signing up.
VMRedakcja VitMode — Hormony i endokrynologia13 min
October 3, 2026
GuidesZinc and Copper: Why Long-Term Zinc Supplementation Can Cause Copper Deficiency
Zinc is one of the most popular minerals people supplement — for immunity, fertility, skin health. Rarely discussed is its quiet antagonist: a well-documented, if lesser-known, risk of copper deficiency from long-term, high-dose zinc use. In extreme but real cases, this leads to serious, partly irreversible spinal cord damage.
VMRedakcja VitMode — Badania i biomarkery12 min
September 30, 2026
GuidesVitamin D and Statins: Does Supplementation Affect Cholesterol Drug Effectiveness?
For years, a popular belief has circulated that low vitamin D worsens the painful side effects of statins, and that supplementing it can prevent them. A large, randomized trial called VITAL, involving more than 2,000 new statin users, gave a clear but under-reported answer — and explains why this intuitive hypothesis didn't hold up under closer scrutiny.
VMRedakcja VitMode — Serce i układ krążenia12 min
September 30, 2026
GuidesMagnesium and Blood Pressure Medications: Interactions and Safety
Magnesium is sometimes called a “natural calcium channel blocker” — and that's not just a catchy marketing phrase, but a description of a real physiological mechanism. That also means that for people on blood-pressure medication, magnesium supplementation isn't neutral: it can add to a drug's effect, especially with calcium channel blockers, and the risk grows further when kidney function is impaired.
VMRedakcja VitMode — Serce i układ krążenia12 min
September 30, 2026
GuidesOmega-3 and Blood Thinners: The Real Bleeding Risk
The warning “omega-3 thins your blood, be careful with blood thinners” repeats online so often it's treated as settled fact. Yet the largest meta-analysis of clinical trials to date, covering more than 120,000 patients, paints a far more measured picture than the popular warnings suggest — though not entirely free of nuance at very high doses.
VMRedakcja VitMode — Serce i układ krążenia13 min
September 30, 2026
GuidesNAC and Acetaminophen: Does Supplementation Protect the Liver During Regular Painkiller Use?
N-acetylcysteine (NAC) is the only recognized, life-saving antidote for acetaminophen (paracetamol) poisoning — well-established, well-documented medical knowledge for more than forty years. Far less clear, and often wrongly conflated with that fact, is a completely different question: does daily, prophylactic NAC supplementation protect the liver of someone who simply takes acetaminophen regularly at normal doses for a headache or fever. These are two different questions with two different answers.
VMRedakcja VitMode — Zdrowie psychiczne12 min
September 30, 2026
GuidesCurcumin and Blood Thinners: Interactions and Dosage
Curcumin, the main active compound in turmeric, has documented, though mild, antiplatelet activity and affects the enzymes that metabolize some blood-thinning medications. At typical, low-bioavailability supplement doses, the risk of a clinically significant interaction is mostly reported at the level of isolated case reports, but it rises noticeably with piperine-enhanced formulas and in people already taking warfarin, a DOAC, or aspirin. That distinction — dose and form, not the mere fact of taking curcumin — is what actually determines the real risk.
VMRedakcja VitMode — Sen i neurobiologia12 min
September 30, 2026
GuidesVitamin K2 and Warfarin: The Key Interaction You Need to Know
This is one of the best-documented and clinically most important supplement-drug interactions in this series: warfarin works by blocking the recycling of vitamin K in the liver, and vitamin K2 supplementation supplies exactly what the drug is blocking. A randomized trial in people treated with a vitamin K antagonist anticoagulant showed that even small doses of menaquinone-7 (MK-7) — on the order of a few dozen micrograms a day — significantly lowered INR. This isn't a reason to avoid vitamin K2 entirely, but it is a reason never to start or stop it without the knowledge of the doctor managing your anticoagulant therapy.
VMRedakcja VitMode — Serce i układ krążenia13 min
September 30, 2026
GuidesL-Theanine and Caffeine: Synergy and Dosage
Unlike most topics in this series, combining L-theanine and caffeine isn't a dangerous interaction — it's a synergy, and one of the better-documented ones in the world of nootropic supplements. Several randomized studies show that L-theanine smooths out caffeine's stimulant profile, reducing the typical jitteriness and racing heart, while the combination improves performance on attention-demanding tasks more than either component alone. This is a rare case where "the effect together is greater than the sum of its parts" has real, repeatable backing in the literature.
VMRedakcja VitMode — Żywienie, suplementy i trening12 min
September 30, 2026
GuidesMagnesium and Antibiotics: Does Supplementing Impair Drug Absorption?
This is one of the better-documented, clinically significant mineral-drug interactions: magnesium ions in the gut form insoluble complexes with certain antibiotics — chiefly fluoroquinolones (e.g. ciprofloxacin) and tetracyclines (e.g. doxycycline) — that the body simply can't absorb. The consequence isn't toxicity, but something potentially more dangerous in the context of an infection: undertreatment and a risk of antibiotic therapy failing. The fix is a simple, but often overlooked, step — keeping an appropriate time gap between magnesium and the antibiotic.
VMRedakcja VitMode — Badania i biomarkery12 min
September 30, 2026
GuidesIron and Levothyroxine: Why the Timing Gap Between Supplement and Drug Matters
Iron binds to levothyroxine in the digestive tract, forming a complex too large for the body to absorb — a well-documented, clinically significant interaction, confirmed in a study where regularly taking both substances together raised TSH in patients previously stably treated for hypothyroidism. This issue especially and repeatedly affects the same group of patients — women with hypothyroidism, among whom coexisting iron deficiency is a common occurrence, not a rare coincidence.
VMRedakcja VitMode — Hormony i endokrynologia12 min
September 30, 2026
GuidesCan Creatine Raise Creatinine Even With Healthy Kidneys?
Creatine supplementation almost always raises your blood creatinine result — that's a fact confirmed across dozens of studies. The question is whether that means a kidney problem or just an artifact of how eGFR is calculated. We answer directly and show how much the result really rises.
VMRedakcja VitMode — Żywienie, suplementy i trening11 min
September 27, 2026
GuidesDo You Need to Stop Creatine Before a Creatinine Test?
Usually you don't need to stop creatine before a routine blood test. We explain when a break actually makes sense, how long it should last, and why skipping one day barely changes anything.
VMRedakcja VitMode — Żywienie, suplementy i trening10 min
September 27, 2026
GuidesCan Eating Meat Before a Test Raise Creatinine?
A large cooked-meat meal can raise blood creatinine much more than most people expect — a classic study found an increase of nearly half. We explain the mechanism and how many hours you should wait before a test.
VMRedakcja VitMode — Żywienie, suplementy i trening11 min
September 27, 2026
GuidesCan Dehydration Raise Creatinine Even With Healthy Kidneys?
Dehydration can transiently raise a creatinine result even in someone with healthy kidneys — through two overlapping mechanisms: blood concentration and reduced kidney blood flow. We explain when this actually matters and when it doesn't.
VMRedakcja VitMode — Żywienie, suplementy i trening12 min
September 27, 2026
GuidesCan Leg Training Raise AST More Than ALT?
Heavy leg training can raise AST noticeably more than ALT — and that's not a coincidence. AST is abundant in skeletal muscle; ALT is far more liver-specific. We explain the mechanism and how to tell this apart from a real liver problem.
VMRedakcja VitMode — Żywienie, suplementy i trening11 min
September 27, 2026