Restricting your diet and cutting out food groups such as wheat or dairy does not eliminate toxins. If you think you have an allergy to any food groups, see your doctor.
There is no scientific evidence to show that sugar is toxic. However, if you eat a lot of refined sugar, cutting back on it or cutting it out completely is a good thing because it provides empty calories and so doesn't make a positive contribution to your diet. Don't forget that so-called 'natural' sugars, such as honey and maple syrup, are still sugars.
If you are considering a juice-based detox, remember that fruit tends to be high in sugar and consuming an excessive amount of fruit in juices will not be good for you. The acid in the fruit also damages the enamel that protects your teeth.
If you're tempted to follow a very low-calorie diet with the aim of detoxing rather than weight loss, be aware that fasting can lead to nutritional deficiencies, which could damage your health in the long term. In fact, slashing your calorie intake may also build up chemicals called ketones, which can lead to nausea, dehydrations and light headedness. Moderation, balance and variety are the keys to a healthy diet.
However, if you decide to cut back on processed foods, eating more fruits and vegetables and drinking more water, it can be a good way to kick-start a long-term change towards healthier eating habits.