Table 2 Diet consumption during the exams and corresponding students’ average grades from the last two semesters (n = 608)

Traditional coffee (cups)

Tea (cups)

 0

218 (35.9)

84.06 ± 5.53

0

180 (29.6)

83.87 ± 4.99

 1

110 (18.1)

83.23 ± 6.00

1

138 (22.7)

84.33 ± 5.44

 2

121 (19.9)

83.64 ± 5.46

2

136 (22.4)

82.57 ± 5.77

 3

78 (12.8)

81.79 ± 5.02

3

67 (11)

83.06 ± 5.98

 4

44 (7.2)

82.70 ± 4.51

4

29 (4.8)

82.17 ± 5.14

 5 or more

37 (6.1)

82.34 ± 5.60

5 or more

58 (9.5)

81.96 ± 5.81

Instant coffee (cups)

Mate (cups)

 0

243 (40)

84.26 ± 5.19

0

386 (63.5)

83.29 ± 5.47

 1

207 (34)

83.45 ± 5.27

1

54 (8.9)

82.6 ± 5.63

 2

99 (16.3)

82.17 ± 5.59

2

54 (8.9)

83.66 ± 6.41

 3

32 (5.3)

80.83 ± 6.88

3

34 (5.6)

83.72 ± 6.29

 4

15 (2.5)

81.25 ± 4.96

4

19 (3.1)

83.96 ± 5.71

 5 or more

12 (2)

81.35 ± 7.90

5 or more

61 (10)

83.53 ± 4.35

Item

Weekly Consumption n (%)

Students’ grades

Item

Weekly Consumption n (%)

Students’ grades

Energy drinks (beverages, 250 ml)

Natural fruit juice (cups)

 0

583 (95.9)

83.37 ± 5.43

0

333 (54.8)

83.41 ± 5.11

 1–3

24 (3.9)

82.36 ± 7.37

1–3

250 (41.1)

83.41 ± 5.75

 4 or more

1 (0.2)

83.00

4–6

18 (3)

80.98 ± 8.2

7 or more

7 (1.2)

83.07 ± 7.24

Fruit

Fast food (meals)

 Rarely

158 (26)

82.91 ± 5

Rarely

324 (53.3)

83.91 ± 5.37

 1–2

250 (41.1)

83.66 ± 5.51

1–2

189 (31.1)

82.99 ± 5.33

 3–4

113 (18.6)

83.2 ± 6.50

3–4

61 (10)

82.71 ± 6.51

 Daily

87 (14.3)

83.34 ± 5.05

Daily

34 (5.6)

80.88 ± 5.3

Breakfast (meals)

Snacks (meals)

 0

40 (6.6)

82.57 ± 5.08

Rarely

111 (18.3)

84.28 ± 4.87

 1

33 (5.4)

82.48 ± 6.71

1–2

215 (35.4)

82.72 ± 5.42

 2

34 (5.6)

83.89 ± 5.32

3–4

127 (20.9)

83.56 ± 6.01

 3

31 (5.1)

82.43 ± 5.21

Daily

155 (25.5)

83.31 ± 5.61

 4

26 (4.3)

81.86 ± 4.89

Scheduled eating (breakfast, lunch, dinner)

 5

21 (3.5)

83.22 ± 5.33

Yes

326 (53.6)

83.41 ± 5.77

 6

28 (4.6)

85.60 ± 5.09

No

282 (46.4)

83.25 ± 5.21

 7

395 (65)

83.45 ± 5.54

Alcohol (beverages)

Vit. C (tablets)

 0

566 (93.1)

83.23 ± 5.48

0

440 (72.4)

83.34 ± 5.45

 1

27 (4.4)

84.37 ± 5.00

1–3

130 (21.4)

83.33 ± 5.51

 2–3

9 (1.5)

84.15 ± 8.03

4–6

26 (4.3)

82.83 ± 6.63

 4–6

4 (0.7)

89.75 ± 5.4

7–10

6 (1.0)

83.86 ± 4.32

 7 or more

2 (0.3)

82.50 ± 6.36

11 or more

6 (1.0)

84.00 ± 7.56