Britain's chief medical officer, Professor Dame Sally Davies, made the suggestion in her final report as the United Kingdom government's most senior health adviser, published on Thursday.
It's safe to say the suggestion hasn't gone down well on social media, with many people mocking the idea that the state could remove their right to eat and drink on public transport. Will it help with the obesity problem?
"Today's children are drowning in a flood of unhealthy food and drink options, compounded by insufficient opportunities for being active", Davies said in her report titled Time to solve childhood obesity.
Stopping everyone eating on a train, bus or tram journey is likely to have an incredibly limited effect on a child's general eating habits and will be incredibly hard, if not impossible, to police. She also called for tighter regulations to be placed on the marketing of unhealthy foods and takeaways.
Allow children to grow up free from marketing, signals and incentives to consume unhealthy food and drink - including prohibiting eating and drinking on urban public transport, except fresh water, breastfeeding and for medical conditions. Education rather than such restrictive measures is surely a better way to address childhood obesity. "Government must be courageous and take urgent actions to affect the change we all want and need".
Her report states: "excess weight has slowly crept up on us all and is now often accepted as normal".
Turning to food firms, she said: "I want to see our children's health, not companies" profits, put at the forefront of government policy'.
She adds that around 1.2 million children are classed as clinically obese, with many of them having side effects including Type 2 diabetes, asthma and mental health problems.
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I think I was the first one [to be investigated by the tax authorities] and that is why everything was so hard. He is unpredictable, different and having him in our team would have given us more options".
"We agree more needs to be done to tackle obesity, and welcome the report's clear steer that everyone needs to play their part, including schools, local councils and the NHS". It imposes a tax on sugar-sweetened beverages based on total sugar content.
Davies thinks that tax is an important lever ministers could use and pointed to the success of the sugar tax, which has reduced sugar consumption by more than one-fifth and taken 30,000 tonnes of sugar per year out of the nation's diet.
In her report, she calls for a cap on takeaway portion sizes, cigarette-style plain packaging for junk food and new taxes on "unhealthy" products to "reset" the UK's eating habits.
There is a mandatory "sugar tax" on soft drinks, which is proving much more effective than the voluntary agreement.
As mentioned earlier, she also recommends that all publicly-funded sporting facilities and major sporting events only advertise and sell low calorie, low fat, salt and or sugar products, and supply free and accessible drinking water.
- Curb vehicle speed limits near schools and homes to help improve air quality and encourage children to walk or cycle.
'Every parent wants to know that their child is getting tasty, healthy and nutritious food and they need reassurance that the standards are of the highest quality'.