### substance | particle | grain:

Whole grain
* All whole grains are rich in fiber - as are many fruits and vegetables.
* Most whole grain has density
  - energy density
  - lower energy density
* Most whole grain provides important nutrients
  - other nutrients
* Some whole grain contains grain.
* add necessary bulk to the digestive tract to aid in elimination of wastes.
* appear to play an important role in reducing the risk of colorectal cancer.
* are a healthier way of eating, but the carbohydrate calories are equivalent
  - major contributor to the diet
  - seed that has a thick coat called the husk
  - supplement to pasture that, when fed with hay, promotes healthy digestion
* are also a concentrated source of the antioxidants vitamin E and selenium
  - very high in fiber, which helps prevent constipation as well as some cancers
  - an example of insoluble fiber
  - another category in which people fall short
  - at the center of the spectrum, and are considered the best food to eat
  - excellent sources of nutrients and are helpful in reducing stress
* are foods of high nutritional value
  - that contain the entire kernel or grain, or all the kernel that is edible
  - great in stews and soups
* are high in fiber, complex carbohydrates, vitamins and minerals
  - essential nutrients, and flavor
  - higher in both fiber and nutritional value than refined grains
  - more nutritious than refined grains
* are naturally high in vitamins and fiber, mixing well with a wide variety of foods
  - low in fat unless prepared with added fats
  - particularly high in insoluble fiber
  - rich in fiber, vitamins and minerals
  - seeds of grass
  - sources of plentiful fiber, B and E vitamins, magnesium, copper and zinc
* baked goods contain B-vitamins and minerals.
* contain all parts of the plant kernel, including the fiber-rich bran and the germ
  - three parts of the grain - the bran, endosperm, and germ
  - high concentrations of B complex vitamins
  - many other natural plant compounds called phytochemicals
* contain more fiber, minerals, vitamins, phenols, phytic acid, and phytoestrogens
  - natural fats than their refined and stripped counterparts
  - nutrients and fiber that are important for heart health
  - selenium, as well as fiber, vitamins, and other minerals
* contain the entire seed of the plant, which includes the bran, germ and endosperm
* has benefits
* has lower density
  - numerous benefits
* have a high dietary fiber content, but oat bran provides more than rolled oats
  - host of other health-promoting nutrients
  - whole lot of other nutrients
  - many other heart-healthy qualities, too
* includes breads, pastas, rice, corn and all other grains.
* means that the entire grain kernel is in the food.
* prevent the absorption of calcium.
* provide fiber as well as nutrition.
* provide fiber, potassium and trace nutrients
  - vitamins, minerals and protein
  - many vitamins, minerals and fiber
* provide more fiber and nutrients, such as magnesium, than refined varieties
  - fiber, vitamins and minerals than white bread and refined cereals
  - soluble and insoluble fiber, protein, B-vitamins and minerals
* provides fiber
* reduce chance of heart disease in post-menopausal women.
* tend to be higher in fat content than refined grains and become rancid sooner.

Wood grain
* is grain
  - what most products made of alternative materials are striving to emulate
* produces different surface textures and patterns in the flooring.
* run parallel for maximum resilience.

Heavier particle
* go to the bottom and lighter particles rise to the surface.
* move more slowly than light ones at a given temperature.

Identical particle
* Consider two identical particles.
* move apart form high concentration to low.