bloat

Currently, known side effects are the risk of stomach upset, muscle cramps and bloating.

"She had a bloated abdomen, was irritable and unable to eat anything because the foetuses were squashing her stomach," Dr Anand said.

Blockbusters can be "bloated" and "boring", he adds, plucking out 2017's Transformers: The Last Knight as an example.

"I've really been struggling, not only with stomach bloating, physical pain but also with my mental health on the basis that I thought at one point this was all just in my head," she said.

Despite a noticeable bloating after lying out in the sun, the team found that the whales had all been healthy - though they had not been feeding recently.