"The amount of energy transformed in the body when food and its own material are burned is measured with the 'respiration calorimeter.' When man does no muscular work (save the internal work of the machinery of the body), all the rest of the energy leaves the body as heat. When he does muscular work as lifting weights or real labor, part of the energy appears in the work and the rest is lost in heat. What is used and lost equals the latent energy in the material burned".

This method of measuring the energy latent in food is standard and is approximately correct for that transformed in the body in normal conditions, but it must not be forgotten that different mental states arouse a different supply of energy from the subjective side of life, independent of food, and that some energy from food is stored as fat or used in its formation, instead of being all lost as heat.

Sugars, fats, and starches should be avoided in hot weather to prevent suffering from heat.

When fat is inclined to accumulate, less fat producing food should be indulged and the energy must be used in labor or exercise to prevent an excess of fat.

Many conditions now seeming mysterious and beyond human control can be easily regulated when the chemical composition of food and the purpose of each element is understood. The proteid element being the most vital yet the most neglected or mistreated should be kept in mind by those desiring to prolong life, as enough of the other elements is always blended with it in cereals, nuts, beans, milk, etc., to sustain energy, but the purifying qualities of fruits and fresh vegetables must not be omitted, as ill-health would result even with an abundance of tissue building cells for growth and repair, without plenty of bulk.

The medicinal value of food, especially so far as the purifying of the system is concerned, should be familiar to all. If the liver is inactive and the bowels inclined to constipation, it is unwise to indulge food fostering sluggishness, as the blood is soon loaded with poison. When the opposite condition exists it should not be aggravated by laxative foods, as the blood is devitalized from lack of nutrition. The aim should be to maintain a normal state in which any serviceable food can be digested, but as the proper balance is often lost for a time, such suffering may be avoided by knowing how to restore it quickly.

Among the common laxative foods are potatoes, beans, peas, spinach, turnips, olives, apples, peaches, prunes, figs, cabbage, onions, raw cereals, etc.

Among foods tending to constipation are meats, hot white bread, cooked cereals, hot sweet milk, cheese, honey, blackberries, raspberries, dates, etc.

Many foods, like milk, eggs, nuts, cold and un-fired bread, lettuce, oranges, etc., are neutral.

The succulent vegetables and fruits contain an active principle making different ones serviceable in different diseases, as, lettuce is soothing, as it has a principle similar to opium, yet leaving no bad results.

Onions

Onions dissolve uric acid, contain sulphur, and absorb poison.

Apples, Onions And Lemons

Apples, Onions And Lemons tend to clear the complexion of dark, muddy color caused by uric acid in the blood.

Rhubarb

Rhubarb will relieve constipation if taken without sugar.

Too much cane sugar interferes with the normal action of the liver.

Turnips, Onions, Cabbage, Cauliflower, And Water Cress

Turnips, Onions, Cabbage, Cauliflower, And Water Cress contain sulphur for purifying the blood.

Beans, Spinach, Raw Cabbage

Beans, Spinach, Raw Cabbage, contain iron and are a great benefit to aenemic people.

Carrots

Carrots are rich in iron and increase the red cells of the blood. They also tend to clear and beautify the complexion.

Celery

Celery is serviceable in counteracting conditions that lead to rheumatism and neuralgia.

Tomatoes

Tomatoes stimulate the liver.

Potatoes

Potatoes contain salts of potash that counteract uric acid.

Melons

Melons arouse the kidneys and bowels and keep the system cool.

Peaches

Peaches have iron for the blood.

Prunes

Prunes are laxative and soothing to the nerves.

Berries

Berries are rich in iron, but should not be indulged in large quantities at a time, as the seeds tend to clog the intestines.

Unripe fruit should be avoided, as its chemical composition is not yet suited to the human system. The cell wall is not expanded as it is when filled with juice. The necessary changes for its best use take place during the ripening process. Green vegetables serve the best purpose in the milk stage, after which nature protects many of them during the process of chemical changes required for maturity and the full development of the tissue building cells.

Grapes

Grapes are rich in mineral salts for purifying and enriching the blood, and when judiciously used, changing from sweet varieties to the semi-acid as the system demands they overcome many diseases.

A neglect of fruit and vegetables in the regular diet results in disease conditions of the nature of scurvy, while too much fruit causes an accumulation of acid in the system, hence for the best results it must be used like all other food with good judgment Fruit may be indulged more freely than other foods at irregular intervals as it is largely water, but it is more satisfying and of greater value when intelligently blended with every meal. It is customary at present to indulge a full meal, leaving the tempting fruit to crowd upon top of it, often causing discomfort, while a little fruit at the beginning of a meal tends to prevent over-eating. Scientific living and good health, as a rule, demand less food, instead of more food. Even plants and animals do not thrive well when over-watered or over supplied in any way.