Go to:\

http://www.cs.princeton.edu/~ah/food/

Click on "search by name" then type in "peanut butter"

Peanut butter

NDB No: 16398
Nutrient     Units     Value per 100 grams of edible portion    
Proximates                    
Water     g     1.22     409     0.016    
Energy     kcal     593     0        
Energy     kj     2482     0        
Protein     g     25.21     629     0.048    
Total lipid (fat)     g     51.03     602     0.060    
Ash     g     3.25     368     0.007    
Carbohydrate, by difference     g     19.29     0        
Fiber, total dietary     g     5.9     7     0.382    
Sugars, total     g     7.81     0        
Minerals                    
Calcium, Ca     mg     38     67     1.114    
Iron, Fe     mg     1.84     510     0.034    
Magnesium, Mg     mg     159     346     2.682    
Phosphorus, P     mg     369     341     1.972    
Potassium, K     mg     669     214     3.751    
Sodium, Na     mg     17     0        
Zinc, Zn     mg     2.92     325     0.019    
Copper, Cu     mg     0.138     50     0.032    
Manganese, Mn     mg     0.447     50     0.102    
Selenium, Se     mcg     7.5     27     0.337    
Vitamins                    
Vitamin C, total ascorbic acid     mg     0.0     0        
Thiamin     mg     0.083     26     0.006    
Riboflavin     mg     0.105     30     0.004    
Niacin     mg     13.403     480     0.047    
Pantothenic acid     mg     0.806     12     0.070    
Vitamin B-6     mg     0.454     14     0.033    
Folate, total     mcg     74     11     10.415    
Folic acid     mcg     0     0        
Folate, food     mcg     74     11     10.415    
Folate, DFE     mcg_DFE     74     0        
Vitamin B-12     mcg     0.00     0        
Vitamin A, IU     IU     0     0        
Vitamin A, RAE     mcg_RAE     0     0        
Retinol     mcg     0     0        
Vitamin E (alpha-tocopherol)     mg     7.68     0        
Vitamin K (phylloquinone)     mcg     0.8     0        
Lipids                    
Fatty acids, total saturated     g     11.193     0        
4:0     g     0.000     0        
6:0     g     0.000     0        
8:0     g     0.000     0        
10:0     g     0.000     0        
12:0     g     0.022     0        
14:0     g     0.217     47        
16:0     g     5.713     47        
18:0     g     2.691     47        
20:0     g     0.700     0        
22:0     g     1.400     0        
24:0     g     0.450     0        
Fatty acids, total monounsaturated     g     24.276     0        
16:1 undifferentiated     g     0.000     0        
18:1 undifferentiated     g     23.843     47        
20:1     g     0.433     47        
22:1 undifferentiated     g     0.000     0        
Fatty acids, total polyunsaturated     g     13.788     0        
18:2 undifferentiated     g     13.710     47        
18:3 undifferentiated     g     0.078     0        
18:4     g     0.000     0        
20:4 undifferentiated     g     0.000     0        
20:5 n-3     g     0.000     0        
22:5 n-3     g     0.000     0        
22:6 n-3     g     0.000     0        
Cholesterol     mg     0     0        
Phytosterols     mg     102     0        
Amino acids                    
Tryptophan     g     0.245     0        
Threonine     g     0.864     0        
Isoleucine     g     0.887     0        
Leucine     g     1.635     0        
Lysine     g     0.905     0        
Methionine     g     0.309     0        
Cystine     g     0.323     0        
Phenylalanine     g     1.307     0        
Tyrosine     g     1.025     0        
Valine     g     1.058     0        
Arginine     g     3.016     0        
Histidine     g     0.637     0        
Alanine     g     1.002     0        
Aspartic acid     g     3.076     0        
Glutamic acid     g     5.269     0        
Glycine     g     1.519     0        
Proline     g     1.113     0        
Serine     g     1.242     0        
Other                    
Alcohol, ethyl     g     0.0     0        
Caffeine     mg     0     0        
Theobromine     mg     0     0        
Carotene, beta     mcg     0     0        
Carotene, alpha     mcg     0     0        
Cryptoxanthin, beta     mcg     0     0        
Lycopene     mcg     0     0        
Lutein + zeaxanthin     mcg     0     0        
USDA National Nutrient Database for Standard Reference, Release 16 (July 2003)

cecelia@ecn.ab.ca wrote or quoted:

That would be cooked bean fat.

It depends on what kind that you buy.  Some of the big brand names --
skippy, jif, etc. -- contain trans fats and added sugar.  "Natural"
peanut butter (which needs to be stirred) normally contains only peanuts
and salt.  This kind contains mostly unsaturated fat but does have a
some saturated fat as well.  In addition, peanut butter contains protein
and some fiber.

Is organic peanut butter better than non-organic one? Anyone?

In this study, 10 out of 36 participants were found to be
positive for the Thomsen-Friedenreich antigen, which
causes the cells of their rectum to divide rapidly (possible
risk factor for colorectal cancer) when they eat peanuts.

Gastroenterology 1998 Jan;114(1):44-9
Peanut ingestion increases rectal proliferation in individuals
with mucosal expression of peanut lectin receptor.
Ryder SD, Jacyna MR, Levi AJ, Rizzi PM, Rhodes JM.
Department of Gastroenterology, Northwick Park Hospital,
Middlesex, England.

BACKGROUND & AIMS: The Thomsen-Friedenreich
blood group antigen (galactose beta 1,3-N-acetyl
galactosamine alpha-) acts as an oncofetal antigen
in the colonic epithelium, with low expression in
normal adult epithelia but increasing to fetal levels
of expression in hyperplasia or malignancy. Peanut
lectin is one of the commonest dietary lectins that
binds this antigen. The aim of this study was to
determine whether peanut ingestion can alter rectal
epithelial proliferation.

METHODS: Thirty-six patients with normal colonic
mucosa consumed 100 g of peanuts each
day for 5 days. Rectal mitotic index was measured
before and after ingestion, and changes in
proliferation were correlated with immunohistochemical
detection of lectin receptor expression by
colonocytes and fecal lectin activity as measured
by hemagglutination assay.

RESULTS: Peanut ingestion caused a 41% increase
in rectal mucosal proliferation in individuals with
macroscopically normal mucosa who express
TF antigen in their rectal mucosae (10 of 36
patients studied). The proliferative response
correlated with fecal hemagglutinating activity, and
peanut lectin could be shown immunohistochemically
within the rectal mucosa.

CONCLUSIONS: The common expression
of galactose beta 1,3-N-acetyl galactosamine
alpha- by hyperplastic and neoplastic epithelia
may therefore be functionally important because it
allows interaction with mitogenic dietary lectins.
This could be an important mechanism for the
association between diet and colorectal cancer.

Here's an interesting table from
http://www.who.int/pcs/training_material/module4/section6.1.htm

Note that conditions which present multiple risks
are called out separately -- for example, the risk
from black lung disease and the risk of an accident
are listed separately for the condition of living in
a coal mine.  Although the benzopyrene risk is
cited for charcoal broiled steaks, the risk from
polyaromatic hydrocarbons and polyamines from
the same steaks is not included in the table.

Note where peanut butter is on this table.
I'll have the charcoal-broiled steaks, please.

Table 12. Risks which increase chance of death by 0.000001

Smoking 1.4 cigarettes -- Cancer, heart disease
Drinking ½ litre of wine -- Cirrhosis of the liver
Spending 1 hour in a coal mine -- Black lung disease
Spending 3 hours in a coal mine -- Accident
Living 2 days in New York or Boston -- Air pollution
Travelling 5 minutes by canoe -- Accident
Travelling 10 miles by bicycle -- Accident
Travelling 300 miles by car -- Accident
Flying 1000 miles by jet -- Accident
Flying 6000 miles by jet -- Cancer caused by
cosmic radiation
Living 2 months in Denver on vacation from
New York -- Cancer caused by cosmic radiation
Living 2 months in average stone or brick building
-- Cancer caused by natural radioactivity
One chest X-ray taken in a good hospital -- Cancer
caused by radiation
Living 2 months with a cigarette smoker -- Cancer,
heart disease
Eating 40 tablespoons of peanut butter -- Liver
cancer caused by aflatoxin B
Drinking Miami drinking-water for 1 year -- Cancer
caused by chloroform
Drinking 30 12 oz. cans of diet soda -- Cancer
caused by saccharin
Living 5 years at site boundary of a typical  nuclear
power plant in the open -- Cancer caused by radiation
Drinking 1000 24 oz. soft drinks from recently banned
plastic bottles -- Cancer from acrylonitrile monomer
Living 20 years near PVC plant -- Cancer caused by
vinyl chloride (1976 standard)
Living 150 years within 20 miles of a nuclear power
plant -- Cancer caused by radiation
Eating 100 charcoal broiled steaks -- Cancer from
benzopyrene
Risk of accident by living within 5 miles of a  nuclear
reactor for 50 years -- Cancer caused by radiation

Some people have an intolerance of peanuts. They are hard to digest, as
they are actually beans not nuts.

In theory the oil in peanuts is mostly mono but that is before the oils
that get added, which are usually polyunsaturated.

Personally I rarely eat them because of their adverse effects.

And as others mentioned, 'peanut butter' usually contains sugar and
assorted random oils to make it smoother and nicer tasting.

Tim Josling