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CLINICAL TOOL · ICMR-NIN 2024 · ESPEN · ASPEN · RSSDI · MIFFLIN-ST JEOR · INDIA-CALIBRATED

Thyroid Health &
Nutrition Calculator

Hypothyroid-adjusted TDEE with −5/−10% metabolic correction · Iodine, selenium & zinc RDAs · Levothyroxine drug-nutrient timing · Thyroid-friendly Indian food plan from IFCT 2017.

−10%BMR reduction in overt hypothyroidism (indirect calorimetry)
133 µgIodine RDA — ICMR-NIN 2024 (India)
60 minLT4 fasting window — no food, coffee or supplements
5–10% Hypothyroid Metabolic Correction · ASPEN/IJCPR
Iodine · Selenium · Zinc — ICMR-NIN 2024 · ESPEN
LT4 Drug-Nutrient Timing Flags · Goitrogen Guidance
Thyroid-Friendly Indian Food Plan · IFCT 2017
THYROID-ADJUSTED DAILY CALORIE TARGET
Complete the form
BMR
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kcal/day
Adj. BMR
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kcal/day
Target
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kcal

Calculate Your Thyroid-Adjusted Nutrition

Mifflin-St Jeor BMR · 5-10% hypothyroid correction · ICMR-NIN 2024 · ESPEN · RSSDI · IFCT 2017

Educational clinical decision-support tool based on ICMR-NIN 2024, ESPEN 2024, ASPEN, and RSSDI guidelines. Not a substitute for clinical diagnosis or endocrinologist/dietitian assessment. Thyroid management, levothyroxine dosing, and comorbid diabetes require individualised clinical care. Always confirm all targets with your endocrinologist and registered dietitian.
Gender, Age, Height & Weight * Mifflin-St Jeor BMR. Indian women: ×0.91 ICMR-NIN correction applied (South Asian phenotype). Weight used for macronutrient gram targets and drug-nutrient interaction flags.
Thyroid Status * Determines metabolic correction factor (δ). Clinical evidence (indirect calorimetry, IJCPR 2024): subclinical hypothyroidism −5%; overt/treated hypothyroidism −10% to −15% below predicted BMR — even when TSH is normalised by LT4 (peripheral T3 tissue deficit persists).
Physical Activity Level * ICMR-NIN 2020 lower PAL ranges (Indian urban population). Hypothyroid patients typically report fatigue and reduced exercise tolerance — err toward sedentary unless confirmed regular activity.
Weight Goal * ASPEN/research consensus: max deficit 15-20% of adjusted TDEE for hypothyroid patients. Severe restriction is algorithmically blocked — caloric restriction suppresses D1/D2 deiodinases, drives T4 → reverse T3 shunting, and compounds the metabolic deficit.
On Levothyroxine (LT4)? If yes, activates drug-nutrient interaction timing flags. LT4 is a narrow therapeutic index drug — calcium, iron, coffee, soy, and fibre all reduce absorption. Correct timing can prevent pseudo-malabsorption and avoidable TSH spikes.
Dietary Pattern * Determines food recommendations. Vegetarians have lower selenium (no organ meats) and potentially lower iodine — supplementation more likely needed. ICMR-NIN: 23% zinc bioavailability assumed for phytate-rich Indian vegetarian diets.
Comorbidities (select all that apply) Modifies macronutrient distribution and adds clinical flags. Diabetes + hypothyroidism: RSSDI 2024 — 20% of T2DM patients have comorbid hypothyroidism; metformin can suppress TSH centrally, masking severity.

Mifflin-St Jeor 1990 · ICMR-NIN 2024 · ESPEN 2024 · ASPEN · RSSDI 2024 · IFCT 2017

THYROID NUTRITION COACHING

Thyroid MNT Support

Personalised hypothyroid meal plans, levothyroxine timing protocols, micronutrient correction and metabolic management from our specialist dietitians.

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WHAT THIS CALCULATOR GIVES YOU

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Thyroid-Corrected TDEEMifflin-St Jeor + −5/−10% metabolic correction (ASPEN/IJCPR 2024)
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Personalised MacrosICMR-NIN 2024 · Diabetic modification if applicable
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Iodine · Selenium · ZincICMR-NIN 2024 RDAs · ESPEN · Indian food sources (IFCT 2017)
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LT4 Timing Protocol60-min window · Calcium/iron/coffee/soy separation flags
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Thyroid-Friendly Indian Food PlanIFCT 2017 · Goitrogen guidance · Daily protocol

CLINICAL REFERENCES

ICMR-NIN (2020/2024)Iodine EAR 95 µg, RDA 133 µg; Se 40 µg; Zn 13/17 mg/day
ESPEN (2022/2024)Micronutrient guidelines; selenium supplementation thresholds
ASPENIndirect calorimetry in hypometabolic states; hypothyroidism
RSSDI (2024)Thyroid dysfunction and diabetes comorbidity guidelines
IFCT (2017)Indian Food Composition Tables, NIN — micronutrient data

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⚕️ Clinical Disclaimer: This calculator provides population-level estimates based on Mifflin-St Jeor 1990, ICMR-NIN 2020/2024, ESPEN 2024, ASPEN, and RSSDI 2024 guidelines. The 5-10% metabolic correction factor is derived from indirect calorimetry research in hypothyroid populations; individual metabolic deviation varies significantly with disease severity, LT4 compliance, and comorbidities. This tool does not replace clinical evaluation, thyroid function testing (TSH, free T3/T4), or individualised management by an endocrinologist and registered dietitian. Levothyroxine dosing and pharmacokinetic interactions require clinical supervision. Do not adjust LT4 dose based on this output. All supplement decisions should be confirmed with your treating physician.