Allergies to Superfoods are more common then one thinks. I am personally very experimental with food and love trying new things, especially when I know that they carry an increased amount of nutrition. However there is something I feel I need to highlight, especially as I see it more and more around me. It seems to be the most common in people who have shifted to a healthy diet that contains many 'new age' foods, and in the process developed digestive issues, respiratory issues and the likes. 
'How can that be?' I hear you say, everything that's healthy is good for us!! 
Well in theory yes, but in practice things are a little bit different. If you think about it, our bodies are used to receiving and processing foods that are grown in areas of the world where we live and where our ancestors lived. The body can get very confused when you give it something that has been grown at 4000m up a mountain on the other side of the world: it has never had it, doesn't recognise it and is simply not physiologically made to consume it. This can result in many different reactions in the body. My suggestion is to be careful when trying something new or unusual, even if its recognised as a superfood. Start with small amounts and keep your awareness on your body and how you feel over the weeks to come. Sometimes the reaction is not instantaneous, but rather a cumulative one as the body ingests more and more of the substance. On a personal note, having never suffered form any allergy at all, I noticed a reaction to the amazing Chia Seeds. After a few months of me consuming them quite frequently, I developed respiratory issues which got progressively worse. Following numerous trips to the doctor and no answers, I proceeded to eliminate several foods and found Chia seeds to be the culprit (symptoms gone for more then a year).
So Yes Superfoods can be absolutely amazing for you, but proceed with care when trying them out, especially with kids as the reactions can be stronger.

DO YOU WANT TO LEARN HOW how you can test yourself for food allergies and hypersensitivities at home? 

Many people are hypersensitive to dairy products and other foods and don't even know it because they never make the connection between low-grade symptoms and something they've eaten. If you notice some stuffiness/congestion, chest tightness, aches and pains, indigestion, skin rash, diarrhea, rapid pulse rate, sleeplessness or some other symptom that is becoming chronic, you may want to try this simple test at home:

-Eliminate the food or ingredient you suspect of causing the symptoms from your diet for 7 days. You can omit several ingredients at the same time (dairy, wheat, eggs or whatever you suspect is causing it), and note how you feel in a diary. If you are not sure of what u should omit, think of what you eat the most of and cut them out. we tend to be allergic to foods that we consume too much of interestingly enough.

-Its common to feel worse on the 3rd and 4th day. Note this if you do.

-Your allergy symptoms should start to feel much better on days 5 through to 7 (if the allergen is amongst the foods that you cut out). Again note this down.

-On Day 8, re-introduce the food that you have ommitted. Do not eat it with any other food and wait for 3 hours before eating anything else. If you've omitted more then one food, introduce each one exclusively on alternate days. For example if you've stopped wheat and dairy, introduce wheat on day 8, then on day 9 stop wheat and have dairy.

If you are allergic to the food you reintroduced, the reaction will be very obvious and you should limit your intake of that food to once a week or stop it completely depending on the severity of the reaction.