The "clean eating movement" has taken the world by storm in recent years.
Magazines, fitness blogs and Instagram are filled with people posing with their green smoothies, kale salads and sugar-free desserts.
While healthy lifestyle changes should be applauded, people have become increasingly neurotic about what they put on their plates, some experts say.
The desire to eat more healthily can veer into an obsession, with rising numbers of people - mainly women in their 30s - suffering from orthorexia nervosa.
Orthorexics spend vast amounts of their time planning their food, resisting temptation, applauding themselves when they stick to their diet.
In its severe form, orthorexia can lead to weight loss, malnutrition and even death, experts warn.
Sufferers typically cut out entire food groups – often in the mistaken belief they are unhealthy or their bodies are intolerant to them – thereby depriving themselves of essential nutrition and vitamins.
At the same time many over-exercise, leaving themselves weak or even emaciated.
This can leave them with low energy levels, nutritional deficiencies which can lead to depression and anxiety.
Often, their obsession with food will stop them socialising with friends, as social event revolve around drinking and eating.
Do you spend more than 3 hours a day thinking about your diet?
Do you plan your meals several days ahead?
Is the nutritional value of your meal more important than the pleasure of eating it?
Has the quality of your life decreased as the quality of your diet has increased?
Have you become stricter with yourself lately?
Does your self-esteem get a boost from eating healthily?
Have you given up foods you used to enjoy in order to eat the 'right' foods
Does your diet make it difficult for you to eat out, distancing you from family and friends? 因为吃健康食品，无法外出就餐，疏远了亲友?
Do you feel guilty when you stray from your diet?
Do you feel at peace with yourself and in total control when you eat healthily?
Yes to 4 or 5 of the above questions means it is time to relax more about food.
Yes to all of them means a full-blown obsession with eating healthy food.