Soybean and Health 2-As a Ca source-Studies of the absorption rate and requirement
for soybean Ca in young and elderly women
TOFU is a good Ca source. Ca concentration of TOFU is ashigh as that of cow’s milk, while bioavailability of theformer is believed to be lower than that of the latter.

Milk
Tofu

Ca (mg/100g)
110120Absorption rate for soybean Ca in young and postmenopausal women （Randomized Cross-over Design)
1st period
A group2 nd period

soybean

10 days

Adaptation
PeriodWashout

5 days10 days

Balancedperiod

10 daysB groupA group milk

5 days

5 daysAdaptation
PeriodWashoutmilk

・ 試験は月経周期を考慮し個別に対応した。
・ 開始日は各自の月経開始から数えて8~10日目とした。

Balancedperiod

10 daysB group

5 dayssoybeanCa in test meals(mg/d Ca) 700

600

500

400

Ca +soybean
milk
Ca300mg/d

Milk
Ca300mg/d

Basal diet
Ca300mg/d

Basal diet
Ca300mg/d

Soybean

Cow`s
milk

300

200

1000

Breakfast
Lunch

DinnerEnergy（kcal)
Protein(g)Fat(g)
Carbohydrate(g)Ca(mg)

ⅠNoodles with lean Pork
Cooked rice
Pork medium fat
Winter melon soupFruit
Cooked riceFried fish with tomatoBoiled Kohlrabi
Fruit

1954
81.2
41.6315
301

Ⅱ
Rice noodles with tomato
Cooked riceFried fish with liquid fish sauce
Mustard green soup
Fruit
Cooked rice
Pork, medium fat
Pumpkin soup
Fried Squash
Fruit
1859
73.4
41.9
298302

Ⅲ
Sticky rice with lean Pork
Cooked riceFried Pork, medium fat
Boiled cabbage
Cooked rice
Boiled chicken
Winter melon soup
Fruit

2179
8464.9316302※ その他、VitD、P、Mg、食物繊維などベトナムRDAを満たすように設定

Results of young female subjects ( Mean±SD )Test meal

Soy milk diet

Cow's milk diet

Intake (mg/d)

578±4578±4Feces (mg/d)469±207466±166

Urine (mg/d)

99±46

101±46

Balance (mg/d)1)9±201

10±168Retention rate (%)2)

1.7±24.7

1.8±29.0

Apparent absorption (mg/d)3)

109±206

112±165

Apparent absorption rate (%)4)

18.8±35.6

19.4±28.51)
2)
3)
4)

Balance (mg/day) = Intake － (Feces + Urine)
Retention rate (%) = Balance / Intake × 100
Apparent absorption (mg/day) = Intake － Feces
Apparent absorption rate (%) = Apparent absorption / Intake × 100* Mean±SD ( n=12 ). Significant differences were not observed between the twogroups by Wilcoxon Signed Ranks Test.

＊n.s.

60

Apparent absorption rate ( % )18.8±35.6

19.4±28.5

5040

Similarabsorption
rates

30
20
100

Soy milk diet

Cow's milk diet

* Mean±SD (n=12). Significant differences were not observed between the two groups
by Wilcoxon Signed Ranks Test.

Apparent absorption rates in young women（%）

Results in post-menopausal women (Mean±SD )Test meal

Tofu diet

Skimmed milk dietbasal diet

Intake (mg/d)

634 ± 10634 ± 10323 ± 8Feces (mg/d)

426 ± 200a

498 ±193a

310 ± 95

Urine (mg/d)

145 ± 42146 ± 54

150 ± 37

Balance (mg/d)1)64 ± 210b-10 ± 203b

-130 ± 102

Retention rate (%)2)

10.0 ± 33.1c-1.6 ± 32.0c-39.4 ± 30.8

Apparent absorption (mg/d)3)

208 ± 200d136 ± 193d

20 ± 95

Apparent absorption rate (%)4)

32.8 ± 31.6e

21.4 ± 30.5e

6.1 ± 28.81)
2)
3)
4)

Balance (mg/day) = Intake － (Feces + Urine)
Retention rate (%) = Balance / Intake × 100
Apparent absorption (mg/day) = Intake － FecesApparent absorption rate (%) = Apparent absorption / Intake × 100* Mean±SD (n=12). Significant differences were observed in values between the same alphabets byWilcoxon Signed Ranks Test (p<0.05).

＊p=0.0347032.8±31.6

Apparent absorption rate(%)

60

21.4±30.5

50

Similarabsorption
rates

4030
20

100Tofu dietskimmed milk diet

*Mean±SD (n=12). Significant differences were observed in values between the twogroups by Wilcoxon’s Signed Ranks Test (P<0.05).

Apparent absorption rate in older women （%）