Dear Cathie,
Wine contains no fat and no protein, but just about all of its not-insignificant
calorie content is in the form of carbohydrates and alcohol, which can be
metabolized much like a carbohydrate. (When given the choice, your body will burn
alcohol for energy before it burns fat. But alcohol does not act as a carbohydrate
so it will not interfere with burning fat in the same way that sugars and other
carbohydrates do.)
Wines vary substantially depending on their alcoholic content and whether they
have residual sugar. For instance, a 5-ounce glass of dry white table wine may
have 1.0 to 1.25 grams of carbohydrates, while a similar portion of red may go
up to 2.5 or 3.5 grams. The biggest problems are with sweet wines. Because of their
high sugar content they will have substantially more carbs. You might get
between 10 and 16 grams in a 3-ounce serving of a strong dessert wine like
Port. Cheaper wines can rack up even more.
When low carb recipes call for wine, always use the lower carb dry wines. The
amounts in recipes add very little problems for anyone's diet regimes, but
drinking wine regularly can be a problem for some, and should never be the
sweeter wines.
We understand your problems finding these answers... In contrast with most foods
and beverages, the regulations in the U.S. (and most other countries) do not
require wine producers to disclose ingredient or nutritional labeling on wine,
and the industry has strongly resisted any legislative efforts to change that.
Accordingly, there's no way (other than asking the winery, which is under no
obligation to respond) to determine the exact nutritional analysis of a
specific wine.
The carbohydrate and nutrition information above came from a querry to the USDA.
Accordingly, here's an ingredient list from a typical bottle of wine:
INGREDIENTS: FERMENTED GRAPE JUICE. NATURAL SULFITES USED AS A PRESERVATIVE.
YEAST AND FINING MATERIALS (EGG WHITE, BENTONITE, ISINGLASS OR OTHER INGREDIENTS)
MAY HAVE BEEN USED IN PRODUCTION BUT DO NOT REMAIN IN THE FINISHED WINE.
Remember when estimating, that even slightly sweet wines, (for example White
Zinfandel or many Rieslings) carry more calories from sugar and more carbohydrates
than the fully dry red and white wines. (Note that serving sizes are almost
always listed as 5-oz servings for dry wines and 3-oz servings for dessert
wines.)
Also beware of liqueurs... Kahlua for example is 17 grams of carbohydrate
and 14 grams of alcohol for 1 jigger
(1 1/2 ounces).
No matter what, remember if you have added alcohol to your regimen and suddenly
stop losing weight, discontinue your alcohol intake.

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