We evolved to like energy-dense foods such as honey, but modern diets tend to include too much sugar. Here’s how to make sure you eat the right amount, at the right time

Sugar tastes great for good reason: we evolved to like it, back when honey was a hard-to-get, energy-dense treat and we spent half of our time running around after antelope. Now that it’s much easier to get and we don’t move as much, that sweet tooth is working against us: many of us are consuming far too much of it, and suffering from poor health as a result. But is there anything specifically bad about it beyond it providing too many calories and not enough nutrients?

“When we taste sugar, the body starts reacting the moment sweetness touches the tongue,” says Dawn Menning, a registered dietitian who works with health app Nutu. “The brain recognises it as a quick source of energy and activates the reward system, releasing the feelgood chemical dopamine that makes it so appealing.” Interestingly, not everyone tastes sugar in exactly the same way – in 2015, researchers compared different types of siblings’ perception of sugar and sweeteners, and found that identical twins were more similar to each other in their sweet taste perception than fraternal twins or non-twin siblings. They concluded that genetic factors account for about 30% of the variance in how sensitive people are to sweet tastes – but it’s unclear whether that actually affects how much we eat.

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There’s no bad time to take a more active interest in your health, but the new year, for lots of us, feels like a fresh start. Maybe you’re planning to sign up for a 10k or finally have a go at bouldering, eat a bit better or learn to swing a kettlebell. Maybe you want to keep up with your grandkids — or just be a little bit more physically prepared for whatever life throws at you.

To help things along, Guardian Live invites you to a special event with public health expert Devi Sridhar, journalist and author Mariella Frostrup, and health and fitness columnist Joel Snape. They’ll be joining the Guardian’s Today in Focus presenter Annie Kelly to discuss simple, actionable ways to stay fit and healthy as you move through the second half of life: whether that means staying strong and mobile or stressing less and sleeping better.