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As healthy food it depends how healthy we are talking, to go full you need to make everything includin sauces from scratch. But without getting into too much here are my tips.
-cut out white foods, replace with wholemeal.
-find organic or natural if you can
-snacks, find healthy snacks, if your not trying to loose weight having nuts or natural Muesli bars (Carmen's are good) carrot sticks etc with you when your out will be good.
-look for healthy ea out alternatives avoid fried foods or batter, go for grilled or steamed foods or sushi etc as a lunch out.
-plate rule 1/4 protien 1/4 carbs 2/4 salad green veggies etc
-bake foods instead at home you don't need oil and you don't get carcinogenic burning.
-opt for lean cuts or meat chicken breast, eye fillet, top loin.
If you want something a little more tender with some fat buy a fattier cut but trim it down as much as possible.
-aim for grass feed beef the omega ratio is about 3:1 which is ideal (keep in mind ratio does not mean its high in omegas)
-Use herbs and spices in food for flavour instead of fats and oils.
-Use healthy fats, monounsaturated is the main player.
-for the sweet kick designate a small meal or desert to have either daily dark cholate is good as ts quite healthy injustice don't eat too many serves. (serving size is what gets ya)
-soda water with fresh juice added (not sugar filled bottle but fresh aha) this can help give you a sweet satisfaction without the massive sugar.
-on that note eat fruit for sugar cravings most are actually moderate to low in GI rating but they deffinately satisfy that sweet taste.
-eat regularly by eating regularly and complex carbs you will keep your insulin and sugar levels steady and provide your boy with glucose steadily this will help prevent those down times or cravings for sugars and other crap.
Some people find it hard to do it all at once so just focus on one thing each week or a few things and then slowly build up.
Oh and don't add salt to food unless medically you have to. Once you are making food from starch its fine but with some prepared things you get a good sack of odium.
Pasta and pasta sauce per serve can easily hit 1.5g / 75%rdi