Question: Does cucumber lower blood sugar in diabetics?

Context:
The ethanolic extract of Cucumis sativus Linn, Cucumis melo utilissimum Roxb, Cucumis melo Linn, Benincasa hispida Thunb Cogn and Tricosanthes anguina Nees, when administered in 250 mg/kg dose, orally to rats failed to lower blood sugar or to depress the peak value, after glucose load.
Ethanolic extract of Tricosanthes dioica Roxb plant caused a significant lowering of blood sugar in fasted rats and depressed the peak value in glucose loaded single and longterm fed groups of rats. The ethanolic extract of the aerial part of T. dioica also induced significant depression in the peak values in the glucose loaded models.
The amount of sucrose in ordinary marinated foods, such as herring, cucumber, and common beet was negligible
Dietary saponins of sea cucumber ameliorate obesity, hepatic steatosis, and glucose intolerance in high-fat diet-fed mice.
In this study, we investigated the effects of saponins of sea cucumber (SSC) on high-fat diet-induced obesity, insulin resistance, and fatty liver in mice.
Mice administrated with 0.1% SSC had significantly decreased serum glucose and insulin levels, lower homeostatic model assessment for insulin resistance index, and area under the blood glucose curve, suggesting that insulin sensitivity is enhanced by dietary SSC.
[Effects of sea cucumber cerebroside and its long-chain base on lipid and glucose metabolism in obese mice].
OBJECTIVE: To investigate the effect of sea cucumber cerebroside(SCC) and its long-chain base(LCB) on lipid and glucose metabolism in obese mice.
CONCLUSIONS: Sea cucumber cerebroside and its long-chain base can improve the glucose and lipid metabolism in obese mice.
The hitherto unknown glucose regulating role of three vegetable peels from cucurbitaceae family was evaluated. In a preliminary study, effects of ethanolic extracts of Cucurbita pepo, Cucumis sativus and Praecitrullus fistulosus peels were studied at 250 and 500 mg kg(-1) d(-1) for 15 days in the alterations in serum glucose and in hepatic lipid peroxidation (LPO) in male mice.
All the three peel extracts nearly reversed most of these changes induced by alloxan suggesting their possible role in ameliorating diabetes mellitus and related changes in serum lipids.
Antidiabetic activity of aqueous fruit extract of Cucumis trigonus Roxb. in streptozotocin-induced-diabetic rats.
Cucumis trigonus Roxb. (Cucurbitaceae) fruit is used in the Indian traditional medicine for the treatment of diabetes. Based on a number of reports on the blood glucose level reduction and the other complications of diabetes associated with some Cucurbitaceae plants, the antidiabetic effect of Cucumis trigonus fruit was investigated.
The antidiabetic activity of aqueous extract of Cucumis trigonus fruit was evaluated by using normal and streptozotocin-induced-diabetic rats.
The aqueous fruit extract of Cucumis trigonus has had beneficial effects in reducing the elevated blood glucose level and lipid profile of STZ-induced-diabetic rats.
Possible amelioration of atherogenic diet induced dyslipidemia, hypothyroidism and hyperglycemia by the peel extracts of Mangifera indica, Cucumis melo and Citrullus vulgaris fruits in rats.
Hitherto unknown efficacy of the peel extracts of Mangifera indica (MI), Cucumis melo (CM) and Citrullus vulgaris (CV) fruits in ameliorating the diet-induced alterations in dyslipidemia, thyroid dysfunction and diabetes mellitus have been investigated in rats.
Rats, treated simultaneously with either of the peel extracts reversed the CCT-diet induced increase in the levels of tissue LPO, serum lipids, glucose, creatinine kinase-MB and decrease in the levels of thyroid hormones and insulin indicating their potential to ameliorate the diet induced alterations in serum lipids, thyroid dysfunctions and hyperglycemia/diabetes mellitus.
Role of pectin from cucumber (Cucumis sativus) in modulation of protein kinase C activity and regulation of glycogen metabolism in rats.
The regulatory role of protein kinase C (PKC) in glycogen metabolism in pectin fed rats was investigated. Administration of pectin (5 g/kg body wt/day) from cucumber (Cucumis sativius L.) led to inhibitory effects on PKC activity in the liver of rats. In the brain and pancreas, PKC activity was significantly higher in pectin-treated rats as compared to the control group. Level of blood glucose was significantly lowered and the level of glycogen in the liver was significantly increased in pectin-administered rats.
Addition of fermented milk (yogurt) and pickled cucumber to a breakfast with a high-glycemic index bread significantly lowered postprandial glycemia and insulinemia compared with the reference meal. In contrast, addition of regular milk and fresh cucumber had no favorable effect on the metabolic responses.
Tolbutamide, Cucurbita ficifolia, Phaseolus vulgaris, Opuntia streptacantha, Spinacea oleracea, Cucumis sativus and Cuminum cyminum decrease significantly the area under the glucose tolerance curve and the hyperglycemic peak.
Two unsaturated fatty acids with potent α-glucosidase inhibitory activity purified from the body wall of sea cucumber (Stichopus japonicus).
In this study, 2 fatty acids with strong α-glucosidase-inhibitory activity, 7(Z)-octadecenoic acid and 7(Z),10(Z)-octadecadienoic acid, were purified and identified from sea cucumber. Therefore, sea cucumber fatty acids can potentially be developed as a novel natural nutraceutical for the management of type-2 diabetes.

Answer: Yes. Based on several scientific reports, ethanolic extract of cucumber and some other Cucurbitaceae plants are associated with a significant reduction of elevated blood glucose level, suggesting that cucumber could have antidiabetic activity.
Exact answer: yes