Well food can be broadly classified as: Alkaline and Acidic. Food that we usually take is 70% acidic and 30% alkaline which in fact must be opposite for healthy living. Human body is Alkaline in nature so; it has to maintain slightly alkaline body plasma. Due to insufficient intake of alkaline food it has restore balance by extracting calcium from bones and other places like teeth etc. In addition to this lack of Vitamin D due to lack of sunlight and animal food (that vegetarians don’t eat) are the reasons for continual increase in Dental diseases, brittle bones and Arthritis.

Acidic environment leads to the development of harmful bacteria and alkaline environment leads to the development of good ones.

All types of cereals and medicines are strongly acidic and kill useful bacteria. Excess of sugar, salt and milk are also harmful, rather curd and buttermilk are healthy.

So the nutrition food includes 70%alkaline and 30% acidic food.

Below is the list of alkaline food:
Alkaline fruit:
Lemon
Lime
Avocado
Tomato
Grapefruit
Watermelon (is neutral)
Apple is and watermelon is diuretic in nature and helps reduce salts in body and keep kidney healthy.

Alkaline vegetables especially green vegetables: most of them
but not potato, corn and lentils
Alkaline seeds nuts and grains:
Almonds
Pumpkin
Sunflower
Sesame
Flax
Buckwheat Grouts
Cumin Seeds
Any sprouted seed
Alkaline Drinks:
‘Green Drinks’
Fresh vegetable juice
Pure water (distilled or ionized)
Lemon water (pure water + fresh lemon or lime).
Herbal Tea
Vegetable broth
Non-sweetened Soy Milk
Almond Milk
Never tea, coffee and carbonated drinks like colas.
Fat and oils:
Flax
Hemp
Avocado
Olive
Evening Primrose
Borage
Coconut Oil

Others:
Sprouts (soy, alfalfa, mung bean, wheat, little radish, chickpea, broccoli etc)

These points should also be taken care of for healthy living:

o Fats and oils should not exceed 10-15 ml per day (3 tea spoons)
o Carbohydrate based foods should be minimized as much as possible.
o Avoid sugar and salt as much as possible.
o Drink lot of water (3-4 liters a day in summers).
o To avoid Dental problems, use mouthwash at night.

Along with a healthy diet, exercise is an essential part of a healthy living. One-third of body toxins are removed by sweat only. Otherwise it will have heavy burden on Liver and Kidney. Elevators and Air-conditioned cars have finished little bit chance of sweating. Thus, make yoga and Pranayama your routine.

But always remember that nothing can replace a knowledgeable and well-meaning Doctor. Do not forget to have a regular medical checkup.