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GLI ALIMENTI
Denise
Created on March 20, 2024
food
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Transcript
Lezione di tecnologia
Gli alimenti
Start
Indice
I principi nutritivi
I principali alimenti
Il valore energetico
L'alterazione degli alimenti
L'etichetta
Le tecnologie di conservazione
Video
Le linee guida per una sana alimentazione
Ringraziamenti
I principi nutritivi
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.
Il valore energetico
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.
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
Le linee guida per una sana alimentazione
Come mantenersi in salute?Segui queste linee guida!
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"Non riesco a sopportare quelli che non prendono seriamente il cibo".
Oscar Wilde
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.
L'alterazione degli alimenti
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.
Le tecnologie di conservazione
- 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°.
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Video
Ecco il video dedicato ai ragazzi utile per imparare a capire cosa significa seguire una dieta sana!
Grazie per l'attenzione!
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- Generate experiences with your content.
- It’s got the Wow effect. Very Wow.
- Make sure your audience remembers the message.
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Use this space to add awesome interactivity. Include text, images, videos, tables, PDFs... even interactive questions! Premium tip: Get information on how your audience interacts with your creation:
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Let the communication flow!
With Genially templates, you can include visual resources to wow your audience. You can also highlight a particular sentence or piece of information so that it sticks in your audience’s minds, or even embed external content to surprise them: Whatever you like! Do you need more reasons to create dynamic content? No problem! 90% of the information we assimilate is received through sight and, what’s more, we retain 42% more information when the content moves.
- Generate experiences with your content.
- It’s got the Wow effect. Very Wow.
- Make sure your audience remembers the message.
Got an idea?
Use this space to add awesome interactivity. Include text, images, videos, tables, PDFs... even interactive questions! Premium tip: Get information on how your audience interacts with your creation:
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Let the communication flow!
With Genially templates, you can include visual resources to wow your audience. You can also highlight a particular sentence or piece of information so that it sticks in your audience’s minds, or even embed external content to surprise them: Whatever you like! Do you need more reasons to create dynamic content? No problem! 90% of the information we assimilate is received through sight and, what’s more, we retain 42% more information when the content moves.
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- Generate experiences with your content.
- It’s got the Wow effect. Very Wow.
- Make sure your audience remembers the message.
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- Activate user tracking;
- Let the communication flow!
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Let the communication flow!
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- Generate experiences with your content.
- It’s got the Wow effect. Very Wow.
- Make sure your audience remembers the message.
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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