Nutriciondannifitmx

01/04/2026

Insulin Resistance

Insulin is present.
But not effective.

Cells stop responding properly to insulin.
Glucose cannot enter easily.

Blood sugar stays high.
Pancreas produces more insulin to compensate.

Over time, this overload weakens the system.

Fat accumulation, especially visceral fat, worsens resistance.
Inflammation increases.
Metabolism slows.

Energy is available.
But not accessible to cells.

Often silent in early stages.
But leads to type 2 diabetes.

Lifestyle plays a major role.
Poor diet and inactivity accelerate it.

Improve sensitivity.
Reduce the risk.

Not absence of insulin.
Failure of response.

31/03/2026

31/03/2026

Your thyroid doesn’t run on one nutrient. It runs on a system.

Iodine and selenium are trace elements, but without them, thyroid hormone production and regulation break down.

Here’s the biology:

• Iodine is the structural backbone of thyroid hormones.
It is literally built into T4 (thyroxine) and T3 (triiodothyronine).
No iodine → no thyroid hormone synthesis.

• Selenium doesn’t build hormones, but it controls them.
Selenium is required for iodothyronine deiodinase enzymes, which convert inactive T4 into active T3 and regulate hormone turnover.
Selenium-dependent glutathione peroxidases also protect the thyroid gland from oxidative stress during hormone production.

• Tyrosine is the amino-acid scaffold that iodine binds to during hormone synthesis; without it, the process stalls upstream.

This is why iodine without selenium can be problematic, and why improving selenium status has shown benefits in multiple clinical settings related to thyroid and immune function.

Practical Intake Guide (Adults):

IODINE
• Target: 150 mcg/day
• Food sources: iodized salt, seaweed (small amounts), fish, eggs, dairy
• Caution: excess iodine without adequate selenium can strain the thyroid

SELENIUM
• Target: 55 mcg/day (up to ~100 mcg/day commonly used in studies)
• Food sources: Brazil nuts (1–2 nuts), seafood, eggs, whole grains
• Upper limit: 400 mcg/day

TYROSINE
• Typical intake: 500–1,000 mg/day from diet or supplementation
• Food sources: poultry, dairy, fish, legumes, nuts

Thyroid health isn’t about megadosing a single nutrient.
It’s about balance; supporting hormone synthesis, activation, regulation, and gland protection together.

PMID: 18686295

31/03/2026

28/03/2026

Aprende a programar HIFT combinando fuerza y resistencia: diseño de sesiones, control de intensidad, recuperación, y planificación para rendimiento y salud.

25/03/2026

Vitamin D - built in 3 organs

Here’s the shortcut to how sunlight becomes a hormone in 7️⃣ steps:

1️⃣ Sunlight Sparks It
UVB converts 7-dehydrocholesterol in skin into Vitamin D₃.
💡 Low sun, sunscreen, darker skin → less D₃ formed.

2️⃣ Or You Eat It
Fatty fish, eggs, fortified foods, or supplements provide D₂/D₃.
💡 But it’s inactive when swallowed — still just “raw material.”

3️⃣ Liver Conversion Needs Magnesium
In the liver, enzymes (25-hydroxylase) turn D₃ → 25-hydroxy D (calcidiol).
💡 Magnesium is required here as a cofactor — low Mg = stalled activation.

4️⃣ Kidney Activation Needs Magnesium + Iron
In the kidney, 1α-hydroxylase turns calcidiol → calcitriol (active hormone).
💡 This step also needs magnesium. Iron supports enzyme activity, too.

5️⃣ Vitamin K2 Directs the Traffic
Active D increases calcium absorption, but K2 activates proteins (osteocalcin, MGP) that shuttle calcium into bone instead of arteries.
💡 D without K2 = calcium may end up in the wrong places.

6️⃣ Zinc + Vitamin A for the Receptor
Vitamin D works by binding to the Vitamin D Receptor (VDR), which needs zinc for structure and vitamin A (retinoic acid) for full function.
💡 Without these, signaling is weaker even if calcitriol is present.

7️⃣ The Payoff
Active vitamin D regulates calcium & phosphate balance, strengthens bones, helps the pancreas release insulin, and modulates immunity.
💡 But without magnesium, K2, zinc, and vitamin A, the chain breaks.