How does NUTRIMI calculate energy during pregnancy?

For a singleton pregnancy, when profile data and safety checks permit calculation, NUTRIMI estimates basal metabolism from pre-pregnancy weight, applies activity and adds 0 kcal in trimester one, 350 in trimester two and 460 in trimester three.

How does NUTRIMI calculate breastfeeding requirements?

The software uses the 2023 TEE equations with age, height, weight and activity, then adds 400 kcal for exclusive feeding in the first six months, 330 for mixed feeding, 380 in months 6 to 12 and 335 after 12 months.

What happens when data are missing or automatic calculation is unsafe?

The service returns no automatic target and the interface asks for the missing data or refers the user to professional assessment; it does not invent a value.

Verifiable calculation method

Pregnancy and breastfeeding: how energy and macros are calculated.

Values come from deterministic formulas and profile data, not a free-form artificial-intelligence response. When mandatory data or safety conditions are not satisfied, NUTRIMI does not display an automatic target.

See the calculation Open every source

BITE points to a calculated nutrition target — **Calculation, not prescription**Population references require professional assessment in individual or clinical cases.

Technical authorDiego Russo
Verified2 August 2026
Production codeRules checked in the implemented services
SourcesLARN V, NASEM, Italian Ministry of Health

Singleton pregnancy

Due date, pre-pregnancy weight and a safety gate.

The due date determines gestational week and trimester. Pre-pregnancy weight feeds the basal-metabolism calculation and activity produces total expenditure. The energy increment is 0 kcal/day in trimester one, +350 in trimester two and +460 in trimester three. Protein starts from 0.90 g/kg, with increments of +1, +8 and +25 g/day in the three trimesters.

Required data

Active singleton pregnancy, plausible due date, valid pre-pregnancy weight, age, height and activity.

Output

Week, trimester, energy, energy increment, protein, carbohydrate and fat.

Safeguard

The maternal gate can suspend automatic calculation outside its supported scope; no target is returned.

Lactation

Postpartum stage and feeding mode change the calculation.

Baseline energy uses the National Academies 2023 TEE equations with age, height, weight and activity. The increment is +400 kcal/day for exclusive feeding in the first six months, +330 for mixed feeding, +380 from 6 to 12 months and +335 after 12 months. Protein starts at 0.90 g/kg and adds 20 g in the first six months and 13 g thereafter; fat starts at 30% of energy and carbohydrate is constrained to 45-60%.

Separate stages

First six months, second six months and extended lactation derive from the actual birth date.

Consistency check

If resulting fat falls outside 20-35% of energy, the service does not publish the calculation.

No invented fallback

An invalid birth date, weight or other required field returns no calculation, not a generic average.

Declared clinical limit

This page documents software behaviour. Multiple pregnancy, medical conditions, treatment, complications, weight goals and individual cases require healthcare-professional assessment.

Editorial method

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