Some tips for Yoga practitioners:

• Take dinner early in the evening. Avoid carbohydrate rich food and kapha dosha aggravating food items (milk products, banana, guava etc.) in the dinner.
• Eat small quantity of food multiple times rather than together. Make sure you don't feel "full" after any food intake. This way your metabolism will be good and you won't feel sleepy during sadhana.
• Brush your teeth in the night. In the morning drink a glass full of water slowly on empty stomach. If you suffer from constipation add a spoon full of honey and lemon juice to a glass of warm water and drink that on empty stomach.
• After doing Pranayama the perspiration should be rubbed on the skin carefully since it is charged with pranic energy (remember perspiration mentioned here is due to the practice of pranayama and not due to weather conditions).
• First do Yogasana, then Pranayama and finally Dhyana. If you do any other cardio exercises do them before your Yoga session.

As per Ayurveda Onion & Garlic are Tamasik and Rajasik in nature. A peculiar feature of such substances is that they increase agitation, anxiety, inertia, dullness, sleep and ignorance. Due to these properties they are not good for a practitioner of Meditation. A regular consumption of these items will cause you to feel sleepy and dull during meditation.

Onion & Garlic are aphrodisiac. Yoga recommends maintaining celibacy for quick spiritual progress and eating these substances will be contradicting to the basic guidelines of Yoga.

In addition to producing strong odor and taste, they are (especially Garlic) also known to destroy bacteria (good & bad) from the digestive track and too much consumption may have undue effects on digestion.

Of course, eating them once in a while won't cause too much impact but they should be avoided from day to day diet.