Skip to main content

Thank you for visiting nature.com. You are using a browser version with limited support for CSS. To obtain the best experience, we recommend you use a more up to date browser (or turn off compatibility mode in Internet Explorer). In the meantime, to ensure continued support, we are displaying the site without styles and JavaScript.

Woman eating in front of the refrigerator at night

The dip in a person’s blood-sugar levels after breakfast provides a guide to calorie consumption at lunch, dinner and beyond. Credit: Getty

Metabolism

The easy test that predicts the size of your next few meals

One simple measurement provides a quantitative description of hunger.

The drop in a person’s blood-sugar levels a few hours after a meal predicts how much they’ll eat over the rest of the day, suggesting that hunger can be quantified.

Ana Valdes at the University of Nottingham, UK, and her colleagues followed the eating habits of 1,070 healthy adults in the United Kingdom and United States for 2 weeks. Study participants ate a set breakfast and then fasted for 3 hours, after which they ate as they chose. They wore sensors that continuously monitored their blood sugar levels and activity, and logged their meals and hunger levels in a mobile phone app.

Across the group, the drop in blood sugar levels 2–3 hours after breakfast corresponded with the size of the meals that participants ate over the next 24 hours, and matched their reported hunger levels. The authors say that the study, the largest of its kind, provides the best evidence yet that blood-sugar dips could be a possible biomarker for appetite.

However, the dips are just one part of the picture, they add, because appetite is known to be influenced by social, psychological and other factors.

More Research Highlights...

Satellite image of broken iceberg B-44.

Dark water borders chunks of iceberg broken off a West Antarctica glacier. The melting of the region’s ice sheet could allow the bedrock to rise, sloughing water into the ocean. Credit: NASA

Climate change

Antarctic rocks on the rebound could raise sea level much more than expected

When the ice covering the west of the continent disappears, the bedrock could rise up and shove extra water into the ocean.
Monteverde Cloud Forest Preserve, Costa Rica

Mist wafts through the trees at the Monteverde Cloud Forest Biological Preserve in Costa Rica. Cloud forests around the world are threatened by development, wood collection and climate change. Credit: Stefano Paterna/Alamy

Conservation biology

Forests that float in the clouds are drifting away

Tropical cloud forests are safe havens for a vast range of creatures and plants, but they are under siege around the globe.
Illustration of a brown dwarf

A rapidly spinning brown dwarf (pictured, artist’s impression) tends to have narrow atmospheric bands; the faster the spin, the thinner the bands. Credit: NASA/JPL-Caltech

Astronomy and astrophysics

Dim stars that have failed at fusion are masters of spin

Three brown dwarfs whirl on their axes at a dizzying rate that might be close to the celestial speed limit for these bodies.
Aerial photograph of beef cattle standing at the Texana Feeders feedlot in Floresville, Texas

Large-scale facilities such as this feedlot in Floresville, Texas, help to meet the global appetite for beef and other red meat, which remains strong despite the growing consumption of chicken and fish. Credit: Daniel Acker/Bloomberg/Getty

Agriculture

Meat lovers worldwide pay climate little heed

People are eating more poultry and fish — but they’re not giving up their hamburgers.
Midshipmen at dining table eat in formation, CIRCA 1900

Midshipmen in the United States in around 1900. A study found that body-mass index, a gauge of obesity, has increased with the generations during the twentieth century. Credit: Buyenlarge/Getty

Metabolism

A century of US data documents obesity’s racially skewed rise

An analysis also finds that obesity is common at a much younger age among people born in the early 1980s than those born in the late 1950s.
Auroras on Jupiter

Jupiter’s aurora glows blue in this composite image. A newly detected radio signal might be the signature of a similar aurora on a planet in another solar system. Credit: NASA/ESA/J. Nichols, Univ. Leicester

Astronomy and astrophysics

Wiggly signal hints of an aurora on a planet far from the Solar System

A vast radio observatory on Earth detects signals similar to those generated by the aurora on Jupiter.
Nature Briefing

Sign up for the Nature Briefing newsletter — what matters in science, free to your inbox daily.

Get the most important science stories of the day, free in your inbox. Sign up for Nature Briefing

Search

Quick links