Cyclists call it 'the bonk' and it's fucking horrible. It's like been incredibly drunk and tired at the same time. Happened to me the first time I did a 60 mi

Cyclists call it 'the bonk' and it's fucking horrible. It's like been incredibly drunk and tired at the same time. Happened to me the first time I did a 60 mile ride in winter, wind back was brutal, I got about 10 miles from home on the outskirts of town, found a petrol station ate a cornish pasty and two mars bars and it took about 30 minutes before I could summon the energy to get on the bike and coast home. I learnt the lesson the hard way that day. I've found it relatively easy to avoid since mostly by drinking at least a litre of isotonic an hour on the bike (adjusting for climate) and eating reasonable amounts of carbs the day before.