I am trying to find a web site which lists the caloric information and
breakdown into proteins, fats, carbohydrates for a majority of foods.

Hello, garytrent2000, and thank you for your question on such a great
topic for the New Year! I've found some sites that should meet your
nutritional needs.

The best one is theUSDA National Nutrient Database, where you can
search for a term, and get a variety of results. For example, I
searched for "macaroni," and came up with the following results:
http://www.nal.usda.gov/fnic/cgi-bin/nut_search.pl?macaroni
which list everything from Betty Crocker Hamburger Helper including
macaroni, to whole wheat macaroni. The database includes a complete
nutritional analysis of each ingredient, including calories (measured
as energy) and carbohydrates. Here is the link to the database to
begin searching:
http://www.nal.usda.gov/fnic/cgi-bin/nut_search.pl

Here's a guide on how to use the database:
http://www.ars.usda.gov/is/kids/teachers/FoodCompTeacher.pdf

Nutritive Values of Food
http://www.nal.usda.gov/fnic/foodcomp/Data/HG72/hg72.html
Just click on the photo of the cover of this book, and you can read it
online as long as you have Adobe Acrobat Reader installed on your
computer. This is a comprehensive guide that also tells you about
servings and abbreviations used in the book.

Interactive Healthy Eating Index (IHEI)
http://147.208.9.133/
This online tool allows you to enter your dietary information for a
day, up to 20 days, and it will rate your eating habits. It also has
nutritional analysis, and a wide variety of foods in the database, so
you can accurately guage your eating habits.

Calorie King
http://www.calorieking.com/foods/category.php?cat=21
This is an online nutritional reference for restaurant and fast food
menus.

Fat Calories
http://www.fatcalories.com/
Here's another searchable database of fast food and restaurant food
items.

Fiber Content
http://www.wehealny.org/healthinfo/dietaryfiber/fibercontentchart.html
Here's the fiber content of a wide variety of foods.

Thank you for the chance to answer your question. If I can clarify
anything for you, please let me know before you rate my answer. Hope
this helps you!
nvwriter-ga

Search Strategy used:
"nutritional analysis of food"
://www.google.com/search?num=100&hl=en&lr=lang_en&ie=UTF-8&oe=UTF-8&newwindow=1&q=%22nutritional+analysis+of+food%22&btnG=Google+Search
This did not turn up much real info, so I ultimately searched the USDA
site for a variety of information.

Thanks, exactly what I was looking for.