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5/21/14 1:35 P

Hopefully a couple of extra calories are burned as the "math" part of the brain lights up attempting to figure it out. :)

It's true, even if you figure out the exact weight of the product, different lists will give you different calorie counts because the actual fruit can vary slightly due to sugar content and so on. You can't let it make you too crazy. If I find two different calorie counts from reliable sources, I go with the average of the two. It's impossible to know exactly how many calories we're eating or burning from moment to moment, we just have to do the best we can.

Fresh blueberries, yum. Pricey but delicious.

OPERAROCKSTAR SparkPoints: (8,450)
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5/21/14 1:08 P

When I saw "math" my eyes glazed over a bit :)

The best thing I ever did for my weight loss was buy a scale. In instances like this, I end up weighing whatever I'm eating and going by that. I picked mine up fairly cheap at Target.

RUSSELL_40 Posts: 16,826
5/21/14 11:39 A

Blueberries are 81 calories a cup, so even if they vary by as much as 20 %, it is just 16.2 calories. hardly worth consideration.

We tend to eat the same brands, and quantities over time, so as long as you are losing, I wouldn't worry about whether a cup of blueberries was 75 calories, or 86.. I would just use the 81, and it would probably average out over time.

I don't think anyone got fat, eating blueberries. I also think that if you did the same with any food, you would find discrepancies. I recently saw some Fiber One cereal with " 80 calories per serving " on the box. It also had 25 grams of carbs..X 4 calories a gram = 100 calories, not counting the small amount of protein/fat in it, it is still obviously wrong.

You can't get everything 100% right, and that is why SP has ranges of 350 calories. It isn't necessary to be that strict. We bounce around that range by more than 16 calories day to day, but as long as we are headed in the general direction, it is fine. If you have a 500 calorie daily deficit, and it is dropped to 484, because of faulty blueberry labeling, you still lose weight. Discrepancies like this with many foods, may add up to 100 calories a day, but even at a 350 calorie deficit, you are losing weight.

This may explain why you lose a lb in 10 days, instead of 7 days, as planned, but not a cause for concern.. 3 lbs a month is good enough.It is eye-opening to learn why the math never adds up though. You have a 500 calorie deficit, and should be losing 4.285714 lbs. every 30 days.. why is it ONLY 3.5 lbs!!! emoticon

Now I want some blueberries! emoticon

5/20/14 4:36 P

You have been given some great insight.
And if you want to see the actual USDA food database site for blueberries, click here:

Your SP Registered Dietitian

AHHHH! MATH! Do you hear me screaming in fear!

Edited by: DIETITIANBECKY at: 5/20/2014 (16:37)
LEC358 SparkPoints: (11,135)
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5/20/14 3:36 P

Also, blueberries (along with many fruits and vegetables) can have calorie contents that vary by as much as 20% for 100g of the same food. For example, the 100g of cherry tomatoes that I buy this week might have more or less calories than the 100g of cherry tomatoes I buy next week. This is due to different growing conditions, different nutrients in the soil that were picked up (or not) by the plant, level of ripeness, sugar content, etc.

Like the PP said, I'd also go by weight rather than volume but (for me) as long as I'm actually tracking the items I'm eating, the calorie counts aren't particularly important +/- 30%

ICEDEMETER Posts: 1,332
5/20/14 3:31 P

Ok, all of the volume conversion stuff is making my head hurt - which is why I very rarely use a volume measure for anything.

Volume is especially useless when you are looking at something like blueberries, which have different sizes and shapes, and do not fill a container evenly without mad variances in air-space (due to the different sizes and shapes) unless you mash them in to a uniform liquid. It's those mad variances in air-space that will give you the differentials in calories.

The calories by weight, however, are not impacted in the least by air-space, and so are going to be the most accurate. Whether you go by the Spark data-base (56 calories per 100g of fresh blueberries) or the site that you found (57 calories per 100g) isn't going to make enough of a difference to worry about.

Keeping in mind that the database info is based on an average of samples taken from different growing conditions, and that the actual ones that you bought could be higher or lower in sugar content (and thus calories), the closest estimate that you're going to get is to go by weight.

I'd track your 292 grams of blueberries using the Spark database (163.5 calories) and enjoy!

5/20/14 3:16 P

Go by weight. Things settle, shrink etc. Much more accurate to use weight.

PASTAFARIAN Posts: 2,197
5/20/14 3:05 P

I am confused as to the calories in blueberries. Before you respond: "Oh, they're healthy so don't worry about minor discrepancies." Bear in mind that I rarely buy them because they're so expensive. I only buy when my grocer has good deals. Like today: $5 for 2 pints. So I bought two with fond thoughts of consuming both today. But how many calories in what I bought?

The packages say 1 US Dry Pint. Many websites say that 1 US Dry Pint of blueberries are 229c. (Spark says "1 pint as purchased yields" 225c. Some sites say 230c. Let's ignore minor discrepancies like that.)

But the USDA analyzes blueberries in the following terms:
By volume: 1 cup = 84c (wiki
By weight: 100g = 57c

Using USDA's volume measure, there are (roughly) 2.3 cups in 1 dry pint so 84 * 2.3 = 195.5c which is significantly different than 229. Since I had intended to consume 2, the difference is (229-195.5)*2 = 67c.

Using USDA's weight measure, I multiplied it by the actual weight of the blue berries (292c) to get = 166c leaving a difference of 63c per pint (or 126 for my 2 pints).

PS: I suppose my blueberries could have dehydrated a bit but they actually look quite plump. No wrinkling and they fill the container.

So now I have three different claims of the calories in 1 dry pint of blueberries:

225-230c (many websites)
195 (USDA by volume)
166 (USDA by weight)

That's quite a difference. What's going on?

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