Table 1.
Main sources of methylxanthines in diet.
| Dietary Source | Medium Content (mg) | |||
|---|---|---|---|---|
| Caffeine | Theobromine | Theophylline | ||
| Coffee | Expresso (23–70 mL) | 140 (51–532 range) [46] | -------- * | -------- |
| Decaffeinated (30 mL) | 3.0–15.8 range [47] | -------- | -------- | |
| Tea | Black (200–235 mL) | 55.7 (41.6–71.2 range) [48] | 1.8–3.6 [49] | <1 [50] |
| Green (200–235 mL) | 31.0 (20.2–42.8 range) [48] | 0.2–0.7 [51] | -------- | |
| Chocolate | Dark (100 g) | 0.22–0.31 range [52] | 0.26 (0.26–1.16 range) [53] | 0–9 [54] |
| Milk (100 g) | 0.05–0.17 range [52] | 0.17 (0.09–0.28 range) [53] | 5 [54] | |
| Soft-Drink | Cola (330 mL) | 32 | -------- | -------- |
| Diet Cola (330 mL) | 42 | -------- | -------- | |
| Energy Drinks | Red Bull (250 mL) | 80 | -------- | -------- |
* Non-detectible or trace amounts. Soft and energy drink caffeine contents were set according to the manufacturers’ specifications.