TL medico info.

19/08/2026

Vinegar lowers glucose

Apple cider vinegar has built an entire wellness category on a real effect attributed to the wrong ingredient. The glucose-lowering data is genuine. The apple has nothing to do with it.

The acetic acid is what does the work, and any vinegar at the same concentration produces the same effect.

The original Johnston et al. study (Diabetes Care 2004) gave insulin-resistant and type 2 diabetic adults a vinegar drink before a meal containing 87 g of carbohydrates and saw postprandial glucose drop 64% in the insulin-resistant group and 19% in the diabetic group. The sample was small (n=29 crossover) but the effect size was large.

Ostman et al. (Eur J Clin Nutr 2005) ran the dose-response experiment. They served white bread with vinegar at three levels of acetic acid (18, 23, and 28 mmol) to healthy adults. Both glucose and insulin responses fell as acetic acid content rose. The effect tracked the acetic acid content, not the vinegar volume.

The 2017 meta-analysis by Shishehbor et al. (Diabetes Res Clin Pract) pooled the controlled trials. Vinegar consumption with a meal reduced postprandial glucose AUC (SMD -0.60, 95% CI -1.08 to -0.11) and insulin AUC (SMD -1.30, 95% CI -1.98 to -0.62). The effect is consistent and the magnitude is meaningful.

The mechanism is well-characterized. Liljeberg and Bjorck (Eur J Clin Nutr 1998) showed in healthy adults that adding vinegar to a starch meal delayed gastric emptying and that this delay tracked with the improved glycemic response. Slower emptying means slower carbohydrate delivery to the small intestine, which flattens the glucose curve. A secondary mechanism is inhibition of disaccharidase activity by acetate at the brush border. Neither depends on the source of the acetic acid.

The longer-term data is much weaker. Johnston et al. (Food Funct 2020) ran an 8-week trial of daily red wine vinegar in 45 adults at risk for metabolic complications. Fasting glucose and insulin sensitivity improved significantly, but body mass, waist circumference, and visceral fat did not change. The viral "ACV for weight loss" claim has thin support.

Two practical implications. First, if you want the postprandial effect, you need liquid vinegar at roughly 1 to 2 tablespoons. The dose has to deliver around 750 to 1500 mg of acetic acid. White, red wine, rice, and apple cider vinegars all work. Second, the gummies and tablets are a problem. Johnston et al. (J Nutr Metab 2022) tested commercial vinegar tablets head-to-head against liquid vinegar and found the tablets failed to lower postprandial glucose to the same degree.

The mother, the fermentation, the apple, the brand. None of it is the active ingredient. The acetic acid is.

Johnston et al., Diabetes Care 2004 · Liljeberg and Bjorck, Eur J Clin Nutr 1998 · Ostman et al., Eur J Clin Nutr 2005 · Shishehbor et al., Diabetes Res Clin Pract 2017 · Johnston et al., Food Funct 2020 · Johnston et al., J Nutr Metab 2022

Source: William Wallace Ph.D

17/08/2026

Short sleep ages you!!!

Short sleep ages you. Long sleep usually means something is already aging you. Same curve. Different stories.

A new paper in Nature, led by Junhao Wen's lab at Columbia, mapped sleep duration against biological aging across 9 organ systems in half a million UK Biobank adults aged 37 to 84. They used 23 different aging clocks built from MRI scans, plasma proteins, and metabolites. The relationship is U-shaped. The slowest measured aging sat between 6.4 and 7.8 hours per night. Outside that window, in either direction, organs looked older than chronological age would predict.

The two arms of the U are not the same biology.

On the short-sleep side, the causal story is well established. Sleeping under 6 hours raises systemic inflammation, impairs glucose tolerance the next morning, suppresses NK cell activity, and associates with markers of poorer overnight brain waste clearance. Mendelian randomization analyses, including in this paper, support a direct causal effect of short sleep on aging biology. Short sleep drives the wear and tear.

On the long-sleep side, the picture flips. Consistently sleeping over 8 or 9 hours is a well-documented marker of underlying disease, not a damaging behavior in itself. It tracks with major depression, undiagnosed sleep apnea, hypothyroidism, chronic inflammation, and neurodegenerative disease. The authors of this paper note that Mendelian randomization could not strongly support reverse causality on the long arm, but they explicitly could not exclude it either. Decades of prior work in sleep medicine and psychiatry argue that for most long sleepers, the long sleep is the body compensating for something already wrong.

This matters because the practical advice for the two groups is opposite.

If you sleep under 6 hours, the levers are direct. Total sleep opportunity. Sleep timing consistency. Morning light exposure. Caffeine cutoff after lunch. Alcohol stopped three hours before bed at minimum. These are the highest-evidence behavioral interventions in sleep medicine. Sleep extension trials adding 45 to 90 minutes a night have shown improvements in metabolic and cardiovascular markers across small studies.

If you consistently sleep 9 or more hours and especially if you still wake unrefreshed, the right move is to investigate what your body is recovering from. The workup is straightforward. A home sleep study to rule out apnea. TSH, free T4, ferritin, CRP, vitamin D, vitamin B12. Depression and anxiety screening. A review of medications that increase sleep need, including antihistamines, gabapentinoids, mirtazapine, and beta blockers.

There is a third scenario worth naming because it gets lumped in with the long sleepers. Athletes in heavy training blocks, adolescents, people recovering from infection, and people in their first trimester of pregnancy genuinely need 9 to 10 hours and the curve does not apply to them in the same way. The paper looked at habitual sleep in adults aged 37 to 84, not acute recovery states.

The cleaner way to state the finding is this. There is a window in the middle where the body looks youngest on every clock the authors built. Both sides of that window correlate with faster organ aging. The reasons differ. Short sleep does the damage. Long sleep usually shows the damage is already underway.

Wen et al., Nature, 2026 Cappuccio et al., Sleep, 2010 Irwin, Nat Rev Immunol, 2019 Spiegel et al., Lancet, 1999 Tasali et al., JAMA Intern Med, 2022 Besedovsky et al., Physiol Rev, 2019

Source: William Wallace Ph.D

14/08/2026

10/05/2026

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