
Where do proteins come from? Well there are two kinds of protein—complete and incomplete. Complete proteins such as beef, chicken, fish, eggs, milk (just about animal food source) contain all of the essential amino acids. Incomplete proteins come from food sources that do not have all of the essential amino acids—vegetables, fruits, grains, seeds and nuts. Vegetarians can get complete proteins from their foods by combining various incomplete proteins.
Complete Proteins Include:
egg substitutes
fish (flounder, tuna, salmon, trout, cod, halibut, haddock, etc.)
steaks (round, sirloin, flank)
roast beef (the lean deli variety)
ground round or sirloin (buy the leanest available and/or drain the fat after cooking)
Canadian bacon
ham (trim fat)
pork tenderloin (trim fat)
pork chop (trim fat)
cheese (choose the 2% milk fat, lowfat or nonfat varieties)
cottage cheese (lowfat or nonfat)
milk (2% or skim)
yogurt (lowfat or nonfat; )
Incomplete Proteins Include:
corn meal
pasta
pasta
whole grain breads
beans
lentils
soy products
seeds (sesame, sunflower)
nuts (walnuts, peanuts, cashews)
green leafy veggies
broccoli
peas
green leafy veggies
broccoli
peas
The recommended daily allowance of protein is 0.8 grams of protein for every 1 kilogram body weight. To calculate your daily protein needs multiply your body weight in kilograms by 0.8-1.8 g/kg. (To convert your weight from pounds to kilograms, multiply your weight in pounds by 2.2) There's a lot of debate over what's the exact number between 0.8 and 1.8 to multiply by to determine your daily allowance. What I could gleam from the debate was that basically if you're a sedentary person you'll probably multiply by 0.8. The average active person would probably multiply by 1-1.2 and if you're exercising at intense levels for long periods of time, then you'd probably multiply by 1.2-1.8. Most of the sources agreed that you didn't need to go over the 1.8 unless you were a super competitive bodybuilder.

There are lots of "canned" varieties of protein available at your local grocery store, gym, or vitamin/supplement shop. Some brands are made from soy others made from whey. As always there's some debate over which is better for you. Some research shows that 100% whey protein may be better for muscle growth and repair, but soy is still an excellent source of protein especially if you're a vegetarian or lactose intolerant.
The bigger thing to consider than whether you use should buy whey or soy is what else has been added to the one you are buying. Be sure to check the ingredients. Some varieties really pack in the sugar and fat. Find a brand that has the amount of protein you're seeking, but also is low in sugar and fat (especially saturated fat). I've used several brands and found a few that I prefer. Pure Protein made by Worldwide Sport Nutritional Supplements, Inc. is good and contains 23g of protein per serving, only 2 grams of fat and only 1 gram of sugar. The sodium content is pretty low as well. Body Fortress 100% Whey Protein is also good, containing 23g of protein per serving, 1.5g of fat and only 2g of sugar. Body Fortress also makes Super Advanced Whey Protein which contains 26g of protein (the 52g on the bottle refers to a double serving), 2g of fat, and 3g of sugar.
Muscle maintenance is crucial to endurance athletes who depend on muscle mass to train for long distance events, so be sure you're eating your daily required needs of protein as well as using protein in the right proportions for recovery after your workouts.
Muscle maintenance is crucial to endurance athletes who depend on muscle mass to train for long distance events, so be sure you're eating your daily required needs of protein as well as using protein in the right proportions for recovery after your workouts.