Canned prune juice: cup size, sugar and constipation
How many calories are in 8 ounces?
Canned prune juice provides 71 kcal per 100 g. The reference cup weighs 256 g and supplies 182 kcal; half of it, 128 g, supplies 91 kcal. A US cup is eight fluid ounces, not eight ounces by weight. Weigh the contents of your own glass. Fresh plum juice and sweetened stewed-fruit drinks need different calculations. [1]
Is no-added-sugar prune juice sugar-free?
No. The reference reports 16.45 g total sugar per 100 g, or about 21.06 g in 128 g. That 128 g amount contains 22.34 g carbohydrate and 1.28 g fibre. Read the ingredients and sugar declaration as well as calories. Adding cinnamon does not cancel the carbohydrate in the juice. If eating the fruit instead, note the missing sugar data for stewed low-moisture prunes; juice values should not be transferred to cooked fruit.
Does prune juice help constipation?
An eight-week trial involving 84 adults with constipation found improved stool consistency with a specific prune juice product. The study reported industry funding. It does not establish the same effect for every brand or a fixed glass-sized dose for everyone. Persistent constipation calls for assessment of diet and treatment rather than reliance on juice alone. [2]
Must it be drunk on an empty stomach?
This nutrition table provides no basis for an empty-stomach rule or a treatment dose. Calculating a serving does not mean more is better. Consider fibre intake and adequate fluids together: juice cannot replace whole fruit, legumes and grains. Adult research should not be used to set a dose for babies. [3] The guide to drinks and fluids during constipation puts this distinction into an everyday eating pattern.
