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Transcript
Lezione di tecnologia
Start
Gli alimenti
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Presentation
Start
healthy living
Le tecnologie di conservazione
L'etichetta
Ringraziamenti
Video
L'alterazione degli alimenti
I principali alimenti
Le linee guida per una sana alimentazione
Il valore energetico
I principi nutritivi
Indice
I principi nutritivi
Il nostro corpo è costituito da sostanze organiche e da sostanze inorganiche (acqua e sali minerali). Tali sostanze costituiscono i principi nutritivi che assicurano le attività vitali, la crescita ed il mantenimento dello stato di salute.
I principi nutritivi
Sulle confezioni dei prodotti alimentari sono indicate le caratteristiche nutrizionali: quantità di proteine, zuccheri e grassi e un numero che indica il valore energetico dello stesso alimento, ovvero la quantità di eneregia che viene fornita al nostro organismo da 100 g di quel prodotto.
Il valore energetico
L'etichetta contiene tante informazioni relative all'alimento:
- La denominazione del prodotto
- Le istruzioni per l'uso
- La modalità di conservazione
- Il luogo e l'origine di provenienza
- La data di scadenza
- L'elenco degli ingredienti
- Il quantitativo netto
L'etichetta
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Come mantenersi in salute?Segui queste linee guida!
Le linee guida per una sana alimentazione
Oscar Wilde
"Non riesco a sopportare quelli che non prendono seriamente il cibo".
Author's name
Author's name
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"Lorem ipsum dolor sit amet, consectetuer adipiscing elit"
I principali alimenti
I cereali più coltivati sono:il frumento, il riso, il mais ecc da cui si ricavano la pasta ed il pane.Il latte che è un liquido prodotto dalle ghiandole mammarie dei mammiferi: bovini, ovini e caprini e da cui si ricava il formaggio.I prodotti della pesca si distinguono in: peschi, molluschi e crostacei.L'uovo è un alimento ad alto valore nutritivo ricco di proteine, grassi, sali minerali e vitamine.Gli ortaggi, la verdura e la frutta sono alimenti ricchi di acqua e con basso valore energetico.
Gli alimenti non si conservano per molto tempo, anche se vengono ,mantenuti in frigorifero, al fresco. i fattori che determinano l'alterazione degli alimenti sono:
- fattori fisici: luce e calore
- fattori chimici: ossigeno e acqua
- fattori biologici: enzimi e microrganismi.
L'alterazione degli alimenti
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- Pastorizzazione: si usa per il latte, i succhi di frutta ecc. Si raggiunge una temperatura tra 70° e 80° che varia da pochi secondi a qualche minuto.
- Essiccamento: serve per ridurre la presenza di acqua nell'alimento, ma altera i principi nutritivi contenuti nell'alimento.
- Liofilizzazione: si basa sull'eliminazione di acqua per sublimazione, cioè un passaggio diretto dallo stato solido allo stato gassoso.
- Refrigerazione: consiste nell'abbassare la temperatura dell'alimento, ma mantenendo al di sopra del punto di congelamento dei liquidi nella cellula, quindi tra 0° e 5°.
Le tecnologie di conservazione
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Video
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Videos lorem ipsum dolor
STEP 03
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STEP 02
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STEP 01
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Process
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Process
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VS
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STEP 05
STEP 04
STEP 03
STEP 02
STEP 01
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Timeline
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Map
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Data
Team
NAME 04
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NAME 03
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Team
Grazie per l'attenzione!
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- Controlla il peso e mantieniti attivo
- Limita il consumo di grassi
- Mangia più cereali, legumi, ortaggi e frutta
- Evita di consumare troppi dolci
- Non eccedere con il sale
- Varia sempre la scelta