MedUniDoc

why does 1500 kcal feel like maintenance when it should be a deficit? because four mechanisms are suppressing your metabolism simultaneously and they amplify each other.

@swellagantP @sith_holocron @BioLayne I just posted the breakdown on my profile. It covers the D2/D3 mechanism we touched on. This is the context you need for your next doctor's visit: x.com/MedUniDoc/stat…

the honest answer is that after 55 years, a standard TSH won't tell you much. what actually matters is fT3 the active hormone your cells use and whether rT3 is competing with it. you can have a "normal" TSH and still have tissues running on empty. when you see a doctor next, ask specifically for fT3, rT3, and reverse T3 alongside the standard panel. not every doctor will order it but the ones who understand thyroid physiology will. that's the conversation worth having.

Them: "I ate in a calorie deficit but didn't lose weight!" Also them: "I took a GLP-1 and finally lost the weight!" Who is going to tell them? Should I tell them????

the lab said normal. the biology didn't get the memo. 8/8

and if this sounds familiar from yesterday: leptin resistance suppresses TRH in the hypothalamic PVN. lower TRH → suboptimal TSH drive → thyroid underperforms even before the gland itself is diseased. broken satiety architecture and sluggish thyroid share the same upstream switch. 7/8

your TSH is "normal." you’re exhausted, cold, gaining weight, and in a haze. the doctor says the labs look fine. the problem isn’t your thyroid. it’s what the TSH test actually measures and what it doesn’t. 1/8

the physiology behind this is solid. the cortisol awakening response peaks ~30–60 min after waking; caffeine both blocks adenosine and can nudge cortisol higher, especially in non‑habitual or moderate users. for most high‑stress, high‑caffeine people, a 60–90 minute delay is a simple way to get more stable energy and fewer afternoon crashes.

If you jump straight into caffeine in the morning.... That’s a mistake. Your body naturally spikes cortisol 30–60 minutes after waking to give you energy. If you layer caffeine on top, you disrupt that rhythm. Wait 60–90 minutes before your first coffee. You’ll have more stable energy all day.

@SomerwilTara @thegarybrecka appreciate you. the line between mechanism and marketing gets blurry fast in this space – glad there are people who actually want the pathways, not just the promises.

@MedUniDoc @thegarybrecka Brilliant correction. Thank you for keeping them walking the line and stay on the right side of science . 🙏👍👊

Oxygen is the forgotten nutrient. You can go weeks without food, days without water, but only minutes without oxygen. HBOT supercharges your cells with oxygen, fueling faster healing, better cognition, and longevity.

for a lot of those men, the back issues are exactly because they never built a strong posterior chain. start with pain‑tolerable, coached lifts (hip hinge, split squats, machines), then progress. the data on well‑programmed strength work for chronic low back pain is surprisingly good.

@MedUniDoc @DearS_o_n And what about 90% people who have back issues

Without drugs... what is the greatest weapon against anxiety and depression to a man?

exactly right and the dopamine angle makes it worse than most people think. ultra-processed food bypasses the satiety signal and hits the reward circuit directly. you're not eating because you're hungry. you're eating because the dopamine loop is running independently of hunger. two broken systems, one fork.

@MedUniDoc @gregogallagher Im so pleased to see other people saying what I have been saying. This is a signaling deficit compounded by an availability of crap food that gives a dopamine response.

The Most Powerful Mechanism for Fat Loss Is Not What You Think Calories in versus calories out. Yes. Law of thermodynamics. We know this. So why do some people find fat loss a constant battle while others just get lean almost by accident? The fitness industry says it’s laziness versus effort. That’s bullshit. You know the person who struggles to eat enough and stays lean without trying. You know the person grinding in the gym, running in circles, getting nowhere. Trying desperately to control calories but going over no matter how hard they try. The real answer is satiety signaling. When satiety signaling is downregulated, there is a constant background search for food that never shuts off. Getting lean feels like swimming against a strengthening current. You restrict, hunger fights back harder, and eventually the pull wins. When satiety signaling is dialed in, you eat, fullness arrives, food completely leaves your mind, and fat loss just falls into the background of your life. You get lean and you barely notice it happening. Two completely different biological experiences. If you are in the first bucket and fat loss feels natural and automatic, you do not need any additional support. But if food is a dominant force in your life, if the noise never shuts off, if every cut feels like a war you keep losing, then not using a low dose GLP tool at this point is a mistake

agreed on both counts, plasma is a poor proxy for functional status. leukocytes concentrate ascorbate 14–80x above plasma and retain it longer, which is exactly why serum levels underestimate total body demand. the adrenal piece makes the "regardless of symptoms" framing even more compelling: ACTH triggers ascorbate release within 2 minutes, preceding cortisol secretion. the depletion is happening upstream of symptoms. (PMID 17616774) do you time the morning dose around the cortisol awakening response, or flat BID?

@MedUniDoc @drwilliamwallac No risk is taking 2g BID daily regardless of symptoms

Most people who take vitamin C take 1,000mg in a single pill. Most people who criticize that dose say absorption drops above 200mg so you're wasting your money. Both groups are missing the more interesting part of the data. Levine et al. (1996, PNAS) conducted one of the most rigorous vitamin C pharmacokinetic studies ever done. Seven healthy men were hospitalized for 4 to 6 months on a diet containing less than 5mg of vitamin C per day. They were then repleted at seven sequential doses from 30 to 2,500mg, with steady-state plasma concentrations measured at each level. The absorption curve is sigmoidal. Bioavailability is complete (100%) for a single 200mg dose. At 500mg it drops to roughly 73%. At 1,000mg it drops to roughly 50%. At 1,250mg it is approximately 33%. The intestinal transporter SVCT1 saturates, renal excretion increases, and the fraction you absorb declines with every step above 200mg. Levine et al. (2001, PNAS) confirmed the same pattern in 15 women. This is the part most people stop at. It's also where the analysis gets lazy. The fraction drops, but the total milligrams absorbed still increases. At 200mg you absorb about 200mg. At 500mg you absorb about 365mg. At 1,000mg you absorb about 500mg. You are absorbing more vitamin C at every dose increase. You are just doing it less efficiently per milligram. Less efficient is not the same as useless. This matters because of what happens on the demand side. Immune cells, particularly neutrophils, monocytes, and lymphocytes, actively concentrate vitamin C to levels 50 to 100 times higher than plasma through SVCT2 transporters. In healthy people consuming at least 100mg per day, intracellular concentrations reach roughly 1.5 mM in neutrophils and 3.5 mM in lymphocytes. These cells saturate at about 100mg daily intake under normal conditions. But conditions are not always normal. During infection, inflammation, surgery, or critical illness, plasma vitamin C can drop below 30 micromol/L within days. Activated neutrophils burn through vitamin C during the oxidative burst, taking up oxidized dehydroascorbic acid via glucose transporters and reaching intracellular concentrations as high as 10 mM. The body pool, roughly 1.5 to 2 grams total, can be substantially depleted during severe illness. At that point, the rate of consumption exceeds what a 200mg dose can replace. This is the argument for higher doses during illness. Not that absorption is efficient. It is not. But that the absolute amount reaching your bloodstream is still higher at 500 or 1,000mg than at 200, and during periods of high demand, that additional supply maintains the plasma floor your immune cells draw from. The Cochrane review on vitamin C and the common cold (Hemila & Chalker, 2013) found that regular supplementation (200mg to 2g daily) reduced cold duration by 8% in adults and 14% in children, with larger effects in those under physical stress. The practical insight is not about whether to take more. It is about how to take it. 200mg taken five times per day delivers approximately 1,000mg absorbed, because each individual dose falls within the range of complete bioavailability. 1,000mg taken once per day delivers approximately 500mg absorbed, because the single large dose exceeds SVCT1 saturation. Same total dose. Roughly double the absorption. If you are going to take a gram of vitamin C per day, splitting it into smaller doses across the day is a straightforward way to get more of it into your body. For most healthy people eating a reasonable diet, 200 to 400mg per day is sufficient to saturate plasma and immune cells. Supplementation beyond that has diminishing returns under normal conditions. But during acute illness or high physical stress, the math changes because the demand side changes, and split dosing becomes the most efficient way to meet it. Levine et al., PNAS, 1996 Levine et al., PNAS, 2001 Hemila & Chalker, Cochrane Database Syst Rev, 2013

mostly yes, but the timeline is longer than people expect. 16 weeks of high-fat diet → 4 weeks back on normal food → near-complete reversal of hypothalamic gliosis in the ARC. the catch: caloric restriction alone without changing food composition doesn't clear it. diet quality drives the reversal.

@MedUniDoc @gregogallagher But the inflammation is temporary and goes away if you stop eating the foods that provoke it, right?

because visceral fat runs on different receptor biology. subcutaneous fat: high beta-adrenergic receptor density → catecholamines mobilize it easily. belly fat: high alpha-2 receptor density → same catecholamines hit the brakes instead. add chronic cortisol → preferential visceral deposition on top.

Why is belly fat always the last to leave?

ultra-processed food doesn't just make you fat. it breaks the off-switch. leptin resistance → GLP-1 secretion drops by 28% → satiety signal never arrives → brain keeps searching for food it already had. the signal isn't absent. the receptor stopped listening. Ultra Processed Food went from ~20% to 57% of total calorie intake in the US since the 1960s. we didn't get weaker. we got a different food supply. and if the satiety signal is broken, what do you think happens to the thyroid axis running off the same leptin signal? 🧵 tomorrow.

@KingOfVitamins fair correction. you're right i attacked a causal chain you didn't claim. the delayed recovery mechanism is real. where i'd add precision: the damage variable is sleep displacement, not adenosine blockade per se. same conclusion, different lever.

@MedUniDoc Th entire tweet is about cellular damage as a result of delayed recovery, not as a direct result of caffeine

Caffeine is the most widely used psychoactive substance in the world and it produces zero ATP. It blocks adenosine receptors, suppressing the signal that your cells need recovery and resources. But the need doesn’t go away. When cells don’t get adequate recovery, mitochondria accumulate oxidative damage faster than they can repair it. Cofactors deplete. ATP production capacity drops. The cellular energy system runs on a deficit that compounds quietly underneath the stimulation. The coffee “works” but capacity keeps declining.